On a hot sunny day, which of the following would help protect a plant from water loss?
A. both cuticle and stomata
B. cuticle only
C. stomata only
D. both cuticle and phloem
E. both phloem and stomata
Answer: A. both cuticle and stomata
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The sliding filament model
a. supplies the energy needed for muscle contraction. b. provides a flexing action for the muscle fibers. c. describes the action of the actin and myosin in a muscle cell. d. explains muscle fatigue. e. only explains how muscles contract, not how they relax.
ABO blood types are controlled by
a. single genes. b. multiple alleles. c. incomplete dominance. d. codominance. e. both multiple alleles and codominance.
The leaf arrangement illustrated in the accompanying figure is:
a. pinnate.
b. alternate.
c. compound.
d. whorled.
e. parallel.
Much of the evolutionary history of vertebrates can be seen in the way in which their ________ develop.
A. digestive tracts B. embryos C. nervous systems D. brains E. appendages