Which of the following gymnosperms have male and female organs that are found on separate plants?
a. conifers
b. cycads
c. ginkophytes
d. gnetophytes
c. ginkophytes
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Researchers surgically fuse two of the three ossicles in the inner ear of a mouse, effectively leaving two functional, linked ossicles in place of three. When the mouse's hearing is tested, what outcome would be expected? The mouse would be _____
A) more sensitive to sound, but only in the low-frequency range B) more sensitive to sound, but only in the high-frequency range C) more sensitive to sound in general D) less sensitive to sound in general
A drop of blood entering the heart from the vena cava would pass through which of the following structures before moving through the pulmonary valve?
A. atrioventricular valve B. pulmonary artery C. pulmonary vein D. left atrium E. All of the answer options are correct.
Steroid hormones are derived from
a. free fatty acids. b. cortisol. c. tyrosine. d. cholesterol. e. alanine.
How does a ribbon worm differ from a flatworm?
A. A flatworm has a complete digestive system. B. Flatworms are deuterostomes. C. Flatworms are radially symmetrical and ribbon worms are bilaterally symmetrical. D. A ribbon worm has a mouth and an anus.