We see that in the Eumetazoa, one of the advances is toward bilateral symmetry. What kinds of things does bilateral symmetry enable an organism to do?
What will be an ideal response?
Animals that are bilaterally symmetrical can move using side-to-side movements, plus they have the tendency to evolve a head end, called cephalization. This eventually sets the stage for a central nervous system to control the body.
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During specimen collection, an important thing to remember when handling a collection device with an oxygen-free atmosphere is to:
a. take care not to tip the container. b. hold the collected specimen in the refri-gerator until processing. c. hold the collected specimen in the incu-bator until processing. d. avoid opening the container in an aerobic atmosphere.
The sodium-potassium pump is an example of:
A) active transport. B) receptor-mediated endocytosis. C) passive transport. D) facilitated diffusion.
Which of the following best describes the place adaptive immunity occupies in the animal kingdom?
A) Only mammals have adaptive immunity. B) Only vertebrates, echinoderms, and mollusks have adaptive immunity. C) Only vertebrates have adaptive immunity. D) All animals except sponges have adaptive immunity. E) Only humans have adaptive immunity.
Which vitamin is produced in humans when exposed to sunlight?
a. A b. B1 c. C d. D e. folic acid