What organism is at the first trophic level in a tallgrass prairie ecosystem?
a. birds
b. grasshoppers
c. grasses
d. decomposers
e. parasites
ANSWER: c
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In the 1968 book The Population Bomb, biologist Dr. Paul R. Ehrlich wrote, “The battle to feed all of humanity is over. In the 1970s hundreds of millions of people will starve to death in spite of any crash programs embarked upon now. At this late date nothing can prevent a substantial increase in the world death rate.” Yet this dire prediction did not come true. In which of the following ways did humans push back against this looming crisis?
a. Some forms of birth control were made illegal or difficult to maintain. b. Extensive measures have been instituted to save or extend life through medicine. c. Some countries instituted efforts to control population growth. d. Countries with depressed growth rates made efforts to increase their population growth.
Pleiotropic genes
a. act on secondary sexual characteristics. b. influence more than one aspect of a phenotype. c. are additive. d. produce lethal effects when homozygous. e. fit none of these characteristics
Figure 2-2 represents:
a. elemental helium.
b. molecular hydrogen.
c. molecular helium.
d. a water molecule.
e. molecular oxygen.
The structural unit of compact bone. Consists of an elongated cylinder that runs parallel to long axis of bone. Acts as tiny-weight bearing pillars. Consists of lamellae.
What will be an ideal response?