What Is the Most Compelling Reason Why "Protists" Are Not

question 1

Multiple Choice

What is the most compelling reason why "protists" are not considered to be a taxonomic group?

• A)They are not cellular life forms.
• B)They are too small to be included among the eukaryotes.
• C)The group includes both prokaryotic and eukaryotic cell types.
• D)The organisms often included in this group are very diverse and don't form a cohesive taxon.

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Definitions:

Myelencephalon

Most caudal portion of the embryonic brain; also called medulla oblongata.

Mesencephalon

Midbrain in both the embryo and adult; consists of the cerebral peduncle and the corpora quadrigemini.

Diencephalon

Second portion of the embryonic brain; in the inferior core of the adult cerebrum.

Neural Crest Cells

Embryonic cells that give rise to a diverse cell lineage including melanocytes, craniofacial cartilage and bone, and peripheral and enteric neurons and glia.