Rising air temperatures at the leaf surface can increase evaporation, although evaporation can also cool a leaf
somewhat.
a. True
b. False
ANSWER: True
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What environmental change likely influenced the evolution of bipedalism in humans?
A. Trees grew taller, making it necessary to reach higher to pick fruit. B. Warming of the Earth made it an advantage to get the heat-sensitive brain higher above a hot substrate. C. Evolution of fleeter predators, making it necessary to use the hands to fight them off, rather than try to outrun them. D. The Earth cooled and there was a resultant change from a forested to a grassy landscape. E. Evolution of longer hind limbs made quadrupedal locomotion less effective.
Insects have
a. simple eyes. b. ocelli. c. ciliary eyes. d. compound eyes. e. "camera" eyes
The part of the stomach designated by the letter “I”
in the above figure is called a. pyloric sphincter. b. esophagus. c. mucosa. d. duodenum. e. none of these.
James watson and Francis Crick used X ray to learn about DNA structure
a. true b. false