A positive effect associated with pesticide usage does not include
a. killing disease-causing insects.
b. killing some pathogens.
c. increasing food supplies.
d. increasing profits for farmers.
e. causing cancer.
E
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Which of the following best describes the process of ventilation?
A) the movement of oxygen gas through the blood of the circulatory system B) the movement of carbon dioxide gas through the blood of the circulatory system C) the movement of the respiratory medium past the respiratory surface D) the diffusion of gases into and out of the circulatory system E) the diffusion of gases into and out of tissues where cellular respiration occurs
The benefits to an animal of defending a territory may include
A. food. B. sheltered nesting sites. C. mates. D. Answers A, B and C are correct. E. None of these answers are correct.
Which of the following organisms is an ectotherm?
a. elephant b. lizard c. owl d. bat e. human
When bass were removed from a stream, an algal bloom occurred. This is an example of
A) top-down control. B) bottom-up control. C) the null model. D) apparent competition.