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Illustration of inhaled pollen grains in a lung Pollen grains are allergens and can cause hay fever (allergic rhinitis) when inhaled They can also t
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Illustration of inhaled pollen grains in the windpipe (trachea) Pollen grains are allergens and can cause hay fever (allergic rhinitis) when inhaled
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Illustration of inhaled pollen grains in a lung Pollen grains are allergens and can cause hay fever (allergic rhinitis) when inhaled They can also t
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Illustration of inhaled pollen grains in the windpipe (trachea) Pollen grains are allergens and can cause hay fever (allergic rhinitis) when inhaled
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Illustration of inhaled pollen grains on the nasal epithelium Pollen grains are allergens and can cause cause hay fever (allergic rhinitis) when inha
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Illustration of inhaled pollen grains on the nasal epithelium Pollen grains are allergens and can cause cause hay fever (allergic rhinitis) when inha
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Assorted pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZLOSCIEN
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Assorted pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZLOSCIEN
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Sunflower (Helianthus annuus) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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False-colour transmission electron micrograph (TEM) of a single human spermatozoon the motile male sex cell showing its division into a head and ta
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Sunflower (Helianthus annuus) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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Silver birch (Betula pendula) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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Silver birch (Betula pendula) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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Rose (Rosa sp) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZL
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Rose (Rosa sp) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZL
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Rapeseed (Brassica napus) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by N
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Rapeseed (Brassica napus) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by N
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Rapeseed (Brassica napus) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by N
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Passion flower (Passiflora sp) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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False colour scanning electron micrograph (SEM) of a field of human sperm showing the division of a single spermatozoon into a head tail section T
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Passion flower (Passiflora sp) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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Geranium sp pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZLOS
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Geranium sp pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZLOS
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Eucalyptus sp pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZLO
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Eucalyptus sp pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants by NEMES LASZLO
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Dandelion (Taraxacum officinale) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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Dandelion (Taraxacum officinale) pollen grains illustration Pollen grains are reproductive structures produced by the male parts of flowering plants
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Illustration of a human sperm cell by THOMAS PARSONSSCIENCE PHOTO LIBRARY
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Illustration of a human sperm cell by THOMAS PARSONSSCIENCE PHOTO LIBRARY
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Sperm production Coloured scanning electron micrograph (SEM) of healthy spermatozoa (sperm) emerging from a cavity in the rete testis of a testis Th
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Illustration of a human sperm cell by THOMAS PARSONSSCIENCE PHOTO LIBRARY
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Illustration of human sperm cells by THOMAS PARSONSSCIENCE PHOTO LIBRARY
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Illustration of a human sperm cell by THOMAS PARSONSSCIENCE PHOTO LIBRARY
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Illustration of human sperm cells by THOMAS PARSONSSCIENCE PHOTO LIBRARY
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Human reproduction illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Human reproduction illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Anther structure illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Anther structure illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Soft coral spawning
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Macrophotograph of a section through the ovary of a hyacinth flower Hyacinthus orientalis Pollen is brushed onto the rough-surfaced stigma by visiti
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Spawning Cauliflower coral (Pocillopora meandrina) releasing both eggs and sperm into open ocean just after sunrise in Hawaii A Multiband butterflyfi
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Fertilisation illustration
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Fertilisation illustration
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Fertilisation illustration
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Swimming sperm illustration
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Fertilisation illustration
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Illustration of human sperm fertilising a human ovum or egg cell From Natural Creation and Living being by Dr Jules Rengade (1885) by COLLECTION
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Illustration of a human egg cell or ovum the female reproductive cell At bottom right are three sperm cells the male reproductive cell From Natu
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Sperm illustration by SEBASTIAN KAULITZKISCIENCE PHOTO LIBRARY
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Pollen grain Coloured scanning electron micrograph (SEM) of a pollen grain of the Sycamore tree Acer pseudoplatanus It is triangularly shaped with
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Sperm illustration by SEBASTIAN KAULITZKISCIENCE PHOTO LIBRARY
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Sperm illustration by SEBASTIAN KAULITZKISCIENCE PHOTO LIBRARY
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Sperm illustration by SEBASTIAN KAULITZKISCIENCE PHOTO LIBRARY
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Monohybrid cross lethal gene illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Monohybrid cross total dominance illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Monohybrid cross codominance illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Dihybrid cross illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Dihybrid cross illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Dihybrid cross illustration by ALI DAMOUHSCIENCE PHOTO LIBRARY
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False-colour scanning electron micrograph of pollen grains of Common Mallow Malva sylvestris The grains are spherical about 108 micrometres across
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View from above of a coral spawn slick drifting on the surface of the Pacific off the coast of Maui Hawaii USA; Maui Hawaii United States of Ameri
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A close look at the spawning polyps of cauliflower coral (Pocillopora meandrina) releasing both eggs and sperm into open ocean just after sunrise; Ha
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A close look at the spawning polyps of cauliflower coral (Pocillopora meandrina) releasing both eggs and sperm into open ocean just after sunrise; Ha
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A close look at the spawning polyps of cauliflower coral (Pocillopora meandrina) releasing both eggs and sperm into open ocean just after sunrise; Ha
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A close look the spawning polyps of antler coral (Pocillopora eydouxi) releasing both eggs and sperm into open ocean just after sunrise; Hawaii Unit
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Fertilisation SEM
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Christmas rose (Helleborus niger) reproductive parts
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Christmas rose (Helleborus niger) reproductive parts
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Meiosis light micrograph
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False colour scanning electron micrograph of many pollen grains of a Colts foot Tussilago farfara Its outer wall (exine) consists of sharp spines; t
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Chromosomes condensing during meiosis light micrograph
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Crossing over during meiosis light micrograph
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Crossing over during meiosis light micrograph
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Meiosis light micrograph
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Crossing over during meiosis light micrograph
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Grasshopper spermatozoa light micrograph
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Meiosis light micrograph
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Meiosis light micrograph
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Meiosis light micrograph
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Sperm production Coloured scanning electron micrograph (SEM) of healthy spermatozoa (sperm) emerging from a cavity in the rete testis of a testis Th
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Meiosis light micrograph
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Crossing over during meiosis light micrograph
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Meiosis light micrograph
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Crossing over during meiosis light micrograph
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Spermatogenesis illustration
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Germination of a pollen grain illustration
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Pollen grain structure illustration
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Pistil structure illustration Pistils hold a plants female reproductive structures They contain one or more carpels which in turn contain a sti
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Mitosis and meiosis illustration
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Morning Glory pollen Coloured scanning electron micrograph of a pollen grain of the Morning Glory plant Ipomoea learii The grain has a highly sculp
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Meiosis phases illustration
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Meiosis phases illustration
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Sexual and asexual reproduction illustration
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Sexual and asexual reproduction illustration
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Illustration of the structure of an ovum (egg cell) by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Illustration showing the process of oogenesis the maturation of the ovum (egg cell) by ALI DAMOUHSCIENCE PHOTO LIBRARY
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Human sperm SEM
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Human sperm SEM
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Human sperm SEM
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Rose stamens Coloured scanning electron micrograph (SEM) of stamens in a Garden Rose flower Rosa sp Stamens are the male reproductive organs of the
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