Which of the following is a nonrenewable resource?
a. copper and gold
b. fresh water
c. forests
d. grasslands
e. fish
ANSWER: a
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Which of the following is a neural tube defect that involves incomplete development of the brain and results in stillbirth or death shortly after birth?
A) spina bifida B) neurulation C) anencephaly D) morphogenesis
The similarity between the bodies of sharks and dolphins is an example of convergent evolution. Indicate whether the statement is true or false
A population grows exponentially when
A) the death rate equals the birth rate and immigration is equal to emigration. B) the carrying capacity is exceeded. C) emigration exceeds immigration and the birth rate equals the death rate. D) the birth rate and the death rate are equal. E) the birth rate exceeds the death rate and immigration exceeds emigration.
The most likely explanation for why toothed whales have a blowhole is
A. they evolved from an animal with gills. B. they evolved from an animal with nostrils. C. blowholes are better for large animals. D. blowholes are better for breathing underwater than gills are.