Which cells complete their maturation in the thymus gland?
a. T cytotoxic cells only
b. T helper cells only
c. B cells only
d. Both T cytotoxic and T helper cells
e. T cytotoxic cells, T helper cells, and B cells
d
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____ glands release products onto an internal or external surface
a. Endocrine b. Muscular c. Neural
d. Exocrine e. Connective
Which of the following shows the correct chronological order (geologically oldest to most recent) of near or total extinctions for the organisms listed?
A) dinosaurs, psilopsids, marine invertebrates, large mammals B) psilopsids, marine invertebrates, dinosaurs, large mammals C) large mammals, marine invertebrates, dinosaurs, psilopsids D) marine invertebrates, dinosaurs, psilopsids, large mammals
What represents an organism's genome?
What will be an ideal response?
The only marsupial mammal living in North America is the
A. raccoon. B. wombat. C. weasel. D. opossum. E. ring-tailed cat.