The ovary, three-celled at first, but becoming one-celled and one-seeded by abortion, is surmounted by an inconspicuous perianth with six small teeth. [Please select]
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_ The simplest of the many-celled animals are the sponges, which, with one exception, are salt-water forms. [Please select]
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_ _Body wall_, the outer wall in bodies of the many-celled animals. [Please select]
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Why may this be considered a colonial protozoan and not a many-celled animal. [Please select]
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#Body-wall#, the outer wall in bodies of the many-celled animals. [Please select]
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#Con ju ga' tion#, a process occurring in some one-celled animals, preceding reproduction.' [Please select]
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#En' do derm cells', cells lining inner cavities in the many-celled animals.' [Please select]
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