In the accompanying figure, what process is occurring at point Process B?
a. mitosis
b. meiosis
c. pollination
d. fertilization
e. development of embryo sac
b
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The concordance among monozygotic twins for epilepsy is 37% and for dizygotic twins is 10%. From this information, we can conclude that:
A. epilepsy has only a minor genetic component. B. epilepsy has an important genetic component. C. lifestyle and other environmental factors play an important role in epilepsy. D. epilepsy has only a minor genetic component, while lifestyle and other environmental factors play an important role. E. epilepsy has both an important genetic component and an important environmental component.
Robert Paine was the first biologist to use the term keystone species in the 1960s. He was
studying food webs in the rocky, intertidal pools in the Pacific Northwest. At one of his study
sites, the dominant organisms in the tidal pools were mussels, barnacles, whelks, and a species
of starfish known as Pisaster ochraceus. To examine the relationship between these species,
Paine set up an experiment. In one area, he removed all the starfish from the tidal pools, and
in an adjacent area, he left the tidal pools as he found them. Prior to removing the starfish, he
sampled all the organisms in each pool. After two months, he repeated this sampling. A
summary of his results is illustrated in the graph below.
A hypothesized "first woman" (Eve) probably lived about ________ years ago.
A) 2,000 B) 20,000 C) 200,000 D) 2,000,000
When the left atrium is contracting ____
a. the left ventricle is contracting b. the right atrium is contracting c. blood is moving away from the heart d. blood is leaving the left ventricle e. the bicuspid valve is closed