Which of the following correctly describes the effect parasites have on their host's population size and on the host itself?
A) Parasites have a density-dependent effect, but they do not affect host death rates.
B) Parasites have a density-dependent effect, but they do not usually kill their hosts.
C) Parasites have a density-independent effect, and they usually kill their hosts.
D) Parasites have a density-independent effect, but they do not usually kill their hosts.
E) Parasites have a density-dependent effect, and they usually kill their hosts.
B
You might also like to view...
Currently malaria ____
a. kills about two million people each year in the U.S. b. has no known treatment c. can be prevented with a vaccination d. can be prevented with the drug quinidine e. is a temporary infection
Halogen-containing organic compounds persist in the environment for approximately five years
a. True b. False
Blood calcium homeostasis is maintained by?
a. Calcium excreted or withheld by the kidneys b. Hormones that cause cells to deposit or absorb calcium on/from the bones c. Fat cells that excrete calcium via exocytosis d. liver hormones which remove or add calcium from/to the bloo
Gas exchange is the only function of blood.
Answer the following statement true (T) or false (F)