What unites the organisms shown in the figure?
A) They are all single celled.
B) They all have chloroplasts.
C) They are all archaea.
D) They are all eukaryotes.

Question

What unites the organisms shown in the figure? 
A) They are all single celled. 
B) They all have chloroplasts. 
C) They are all archaea. 
D) They are all eukaryotes.

Quizplus · Accepted Answer

All of the organisms shown in the figure are eukaryotes, as evidenced by their possession of a nucleus and other membrane-bound organelles. Option A is incorrect because the diatom and dinoflagellate are both single-celled, but the other organisms, such as kelp and sea anemone, are not. Option B is incorrect because not all of the organisms have chloroplasts, and those that do (kelp and diatom) belong to different types of algae. Option C is incorrect because none of the organisms belong to the archaea domain, which is comprised of prokaryotic microorganisms with distinct genetic and biochemical properties.

What Unites the Organisms Shown in the Figure