Postnatal growth is most rapid in a human child
a. during the first two weeks.
b. from two weeks to fifteen months.
c. from infancy to ten years.
d. from ages thirteen to nineteen.
e. during adulthood.
Answer: d
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Clonal deletion of developing T lymphocytes takes place in which location(s) in the body?
A. the bone marrow B. the spleen C. the liver D. both the bone marrow and the spleen E. the thymus
Activated B cells divide to form plasma cells and memory B cells, both of which are short-lived and secrete copious amounts of antibody molecules into the bloodstream
a. True b. False Indicate whether the statement is true or false
Which two animals are both classified as suspension feeders?
a. clams and aphids b. clams and fiddler crabs c. lampreys and rabbits d. lampreys and rabbits e. whales and clams
Within the chordate classes, the unique characteristic of the class Aves is:
a. flight. b. production of uric acid. c. feathers. d. endothermy. e. a forked tongue