Natural selection acts on
a. alleles
b. genotypes
c. phenotypes
c
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Which of the following components is not associated with the primary cell wall?
A) cellulose microfibrils B) hemicelluloses C) pectins D) glycoproteins E) lignins
Which of the following is true of predation?
a. A predator exerts selective pressure on its prey. b. A prey exerts selective pressure on its predator. c. In a typical predation case, the predator would not kill its prey. d. Feeding on carcasses is also an example of predation. e. Predator and prey exert selective pressure on one another.
The two countries that make up the majority of the world's population are
a. the United States and China. b. China and Japan. c. the United States and India. d. India and Pakistan. e. China and India.
When the conditions are favorable for a population at low density, such as when a species colonizes a new environment, population growth is typically
A) exponential. B) logistic. C) tangential. D) dynamic.