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In most instances, both sexes of arthropods occur separately. Males commonly pass sperm to females in sealed packets called spermatophores. The males lay these packets on the ground, and the females later pick them up, or the male deposits them into the female's genital opening. Among crustaceans, millipedes, Spiders, mites and some insects, males transfer sperm directly to females. Source: MSN encarta

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16y ago

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