Which statement best describes our current understanding of protist evolution?
A) Protists evolved from multicellular eukaryotes.
B) Protists evolved from eukaryotic parasites.
C) Protists evolved from the Archaea while other eukaryotes did not.
D) Protists evolved from separate branches off the early eukaryotic line.
Answer: D
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Which phylum of vascular, seed-bearing plants is limited to one living species that is a deciduous tree with fan-shaped leaves?
a. Gnetophyta b. Anthophyta c. Cycadophyta d. Ginkgophyta
Phagocytosis is defined as
a. the ingestion of solid material by a eukaryotic cell. b. the uptake of liquid material by a eukaryotic cell. c. cells of the immune system that ingest pathogens. d. the feeding of protozoans.
Long-term exposure to cold can alter metabolism and encourage __________ in which brown adipose tissue produces heat.
Fill in the blank(s) with the appropriate word(s).
Maria is pregnant and a week past her due date, and her doctor decides to induce labor. Her physician will use pitocin, which is a synthetic form of which natural hormone?
A) progesterone B) oxytocin C) estrogen D) prolactin