What is the primary characteristic that groups phyla within the Ecdysozoa?
A. They all have tropchophore larvae.
B. They shed their exoskeletons.
C. They all have spiral cleavage.
D. They all have segmentation.
B. They shed their exoskeletons.
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Stomata close when ____ guard cells and they become ____
a. active transport pumps H+ into; turgid b. active transport of H+ stops in; flaccid c. active transport pumps H+ out of; turgid d. active transport pumps H+ into; flaccid e. active transport of H+ stops in; turgid
What is cartilage composed of?
A. Chondroitin and collagen fibers B. Osteocytes and calcium phosphate C. Chondroitin and calcium phosphate D. Collagen fibers and osteocytes E. Osteocytes and glycoproteins
Which of the following is NOT a risk factor for hypertension?
a. smoking
b. obesity c. chronic stress d. excessive salt intake e. diet high in sources of potassium and calcium
Animals apparently evolved:a
in freshwater. b. in the ocean. c. during the Cambrian explosion. d. in swamps. e. during the Devonian.