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One small animal phylum (Placozoa) contains only two species, Trichoplax adhaerens (T. adhaerens) and T. reptans. There are four types of cells, none of which are nerve or muscle cells, and none of which have cell walls. T. adhaerens sperm cells have never been observed. Embryos up to, but not past, the 64-cell (blastula) stage have been observed.
On the basis of information in the paragraph, which of these should be able to be observed in T. adhaerens?
A) a coelom
B) the process of gastrulation
C) eggs
D) a radially symmetric larval form

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Quizplus · Accepted Answer

Since T. adhaerens embryos up to the 64-cell stage have been observed, it implies that fertilization occurs, which necessitates the presence of eggs, even though sperm cells have not been observed.

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