Fossil fuels ____
a. can be recycled
b. are produced by living organisms
c. are the organic remains of ancient organisms
d. can reduce climate change
e. release less energy than wood when they are burned
ANSWER: c
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Darwin's ideas on evolution were advanced for his time. His approach to science and natural selection were supported by what main tenet?
A. Species were unchangeable over the course of time. B. Operation of natural laws produces constant change and improvement. C. Various organisms and their structures resulted from a spontaneous action. D. The world is fixed and constant.
What does a counter current blood flow supply for cetaceans? a. It transfers oxygen
b. It conserves body heat. c. It increases circulation. d. It improves mobility.
The neurotransmitter acetylcholine ____
a. speeds heart rate b. induces skeletal muscle contraction c. increases anxiety d. has a role in memory and learning e. dilates pupils
The unique feature of HeLa cells that make
them important for research is that a. they are identical to all other human cells. b. they are immortal cells and will grow in culture. c. they are limited in growth cycles. d. they are like stem cells. e. all of these make them important