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But this is to make the qualities indestructible and not dependent upon the composition of the body ; it would no longer be the Reason-Principles within the sperm that produce , for instance , the colours of a bird 's variegated plumage ; these principles would merely blend and place them , or if they produced them would draw also on the full store of colours in the sky , producing in the sense , mainly , of showing in the formed bodies something very different from what appears in the heavens . They produce prodigious numbers of eggs and sperm that undergo fertilization in the ocean .