Species interactions between members of a community include __________ and __________, in both of which one
species benefits at the expense of another. Fill in the blank(s) with the appropriate word(s).
ANSWER: parasitism; predation
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From the plant's perspective, which term best describes carbohydrates in the context of symbiotic relationships with bacteria?
A. a renewable resource B. a loss of energy C. a source of NH3 D. a source of N2
Neurons tend to differ in their (select all correct choices):
A. function. B. size and shape. C. number of extensions.
Allopatric speciation typically occurs in two stages. The first stage is ____ of two populations and the second stage is
____.
a. geographic separation; reproductive isolation b. natural selection; geographic separation
c. mutation; reproductive isolation d. reproductive isolation; geographic separation e. genetic drift; reproductive isolation
Human blood has a pH of about 7.4. If the pH should change to 7.0, this would indicate
A. a decrease in pH. B. an increase in acidity. C. a change in electrolytes. D. All the choices are correct.