Use the Information to Answer the Question

question 36

Multiple Choice

Use the information to answer the question.
Trichoplax adhaerens is the only living species in the phylum Placozoa. 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, nor have embryos past the 64-cell (blastula) stage.
Which of the following T. adhaerens traits is different from all other known animals?

• A) T. adhaerens is multicellular.
• B) T. adhaerens lacks muscle and nerve cells.
• C) T. adhaerens has cilia.
• D) T. adhaerens lacks cell walls.

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Definitions:

MP

This term can refer to multiple concepts; as "Member of Parliament", it denotes a representative elected to the legislative body of a country. In a military context, it stands for "Military Police", a branch of the service concerned with enforcing discipline and the law within the armed forces.

Simp

A slang term often used to describe someone who demonstrates excessive sympathy or attention towards someone else, typically someone they are romantically interested in, in a way that is seen as undignified or without reciprocation.

Conj

Short for "conjunction," a part of speech that connects words, phrases, or clauses in a sentence.

Add

To add means to combine or join something with another, resulting in an increase in quantity, number, or significance.