Plant cells have what is perhaps the most complex outer coverings. Plant cell walls are made largely of cellulose which forms strong, highly rigid, almost indigestible coverings that protect the cell and gives it shape.
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archaeabacteria ( context clues can often give the answer :)
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hkafb I have to go to a meeting
Spermatogenesis is the process in witch spermatozoa are produced from male primordial germ cells by way of mitosis and meiosis.
Oogenesis is the process by which the female gametes, or ova, are created.