The Following Evolutionary Tree Illustrates the Hypothesized Relationships Among the Six

question 6

Multiple Choice

The following evolutionary tree illustrates the hypothesized relationships among the six kingdoms and the three domains. Many biologists have suggested revising the kingdom Protista.One current problem with the protists,as shown in the figure,is that:

• A) protists are single-celled organisms and should be in a separate domain.
• B) the cells of protists contain nuclei and organelles.
• C) some protists, like the red and green algae, are more closely related to plants than to the other protists they are currently grouped with.
• D) chlorophyll would need to evolve independently several times to account for the distribution of photosynthetic groups.

---

Definitions:

Stimulants

Substances that increase physiological or nervous activity in the body, often used to enhance alertness, attention, and energy.

Depressants

Drugs that diminish activity levels in the nervous system.

Nose Drops

A liquid medication intended for administration in the nose to alleviate symptoms such as nasal congestion.

Tolerance

The process of becoming less responsive to a substance or stimulus after repeated exposure.