If a bass kills a perch and eats half the perch, and a crayfish feeds on the other half of the perch, the crayfish is
A. a parasite.
B. a predator.
C. a scavenger.
D. None of these answers is true.
C. a scavenger.
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Which of the following is NOT a characteristic
of type 1 diabetes?
a. insulin levels are normal b. symptoms usually begin in childhood and adolescence c. it cannot be controlled by diet and exercise d. insulin must be injected e. all of these are characteristics of type 1 diabetes
Coccidioides immitis is commonly found in
__________. a. southeastern U.S. b. southwest Canada. c. western Africa. d. southwest U.S. e. none of these.
The release of DDT into the environment to control some insect pests will result in the highest
detectable concentrations a. at the bottom of the food chain. b. in the targeted insect pest. c. in the middle of the food chain. d. at the end of the food chain. e. nowhere, because DDT is degraded rapidly.
CFCs are the primary air pollutants that destroy the ________
Fill in the blank(s) with correct word