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question 4

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One small animal phylum (Placozoa) contains only two species, Trichoplax adhaerens (T. adhaerens) and T. reptans. T. adhaerens is the only species seen in over a century. Individuals are about 1 mm wide and only 27 μm high, are irregularly shaped, and consist of a total of about 2,000 cells, which are diploid (2n = 12) . There are four types of cells, none of which are nerve or muscle cells, and none of which have cell walls. Individual animals move using cilia, and any "edge" can lead. T. adhaerens feeds on marine microbes, mostly unicellular green algae, by crawling atop the algae and trapping it between its ventral surface and the substrate. Enzymes are then secreted onto the algae, and the resulting nutrients are absorbed. 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?

Definitions:

Innermost Layer

The deepest layer within a structure or object, often referring to the inner layer of bodily organs or the Earth.

Equilibrium Receptors

Sensory receptors that help maintain balance and spatial orientation by detecting changes in position or acceleration.

Semicircular Canals

Three looping structures in the inner ear that are instrumental in maintaining balance by sensing rotational movements of the head.

Accommodation

The ability of the lens to change shape, allowing the eye to focus images of objects that are near or far away.