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Sex and Changing Circumstances
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abdomen advertising African queen amoeba anal fin asexual attract bacteria beak become bees beetles begin behaviour beneath biologists birds breeding season brood burrow butterflies cells chances chlamydomonas chromosomes colony coloured completely copulate courtship creatures crickets damselfly diploid display eggs eggs and sperm embryo evolved feeding female's fertilize fight finding a mate fireflies fish flower frogs gametes genes genetic material genital grow hermaphrodite human insects larvae lays her eggs leaves live looking male and female male's mammals meiosis monogamous moth mother mouthbrooding mutations nest offspring once pair palolo worm parents partner pheromone plants and animals pollen polygamous pond predators prey produce protection purple emperor raise release reproduce ritual sacs scent sea aster seeds self-fertilization sexual reproduction signal simply slugs smell snakes social song species sperm spermatophore sponges stags stigma survive swim synchronized tail tambalacoque territory theory tree wings worms young