Which of these animals do not have a closed circulatory system?
A. lions
B. leeches
C. earthworms
D. camels
E. flies
Answer: E
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This part of the brain plays an important role in
reward-based learning and is part of the brain stem. This part of the brain is the
a. pons. b. medulla oblongata. c. midbrain. d. cerebellum. e. cerebrum.
In eudicots, endosperm
a. consists mainly of glucose and water. b. is consumed by the embryo as the seed develops. c. is transferred to the cotyledons. d. is largely unused as the seed develops. e. matures into a fruit.
The process of fermentation allows cells to
a. produce lactic acid as a byproduct in plants b. produce ethanol as a byproduct in animals c. regenerate NADH d. produce ATP when oxygen levels are low
One advantage that enabled the seed plants to greatly surpass the ferns in colonizing the land was the evolution of
A) spores. B) photosynthesis. C) sex without swimming sperm. D) a fibrous root system. E) a woody stem.