The directional growth response of plants to touch is called
A. phototropism.
B. gravitropism.
C. thigmotropism.
D. photoperiodism.
E. thermotropism.
C. thigmotropism.
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In animals, which of the following structures is largely composed of extracellular matrix?
A. kidney B. intestine C. eye D. cartilage E. muscle
The presence of an El Niño event may produce damaging __________ changes in a coral reef
a. chemical b. pH (a measure of acidity) c. temperature d. None of these answers is correct
Weight training increases muscle mass by increasing the
a. amount of protein in individual muscle fibers. b. number of muscle fibers in each muscle. c. amount of glycogen in each muscle fiber. d. a and b. e. a and c.
Which structure folds over to form the neural tube?
a. the coelom b. the primitive streak c. the neural plate d. pharyngeal arches e. the notochord