You are passing through one of the science buildings on a university campus when you see a researcher come out of his laboratory and go into another room. You hear and then see a newly hatched duckling come out of the lab and run to follow the researcher into the other room. The duck's behavior can best be described as
Select one:
a. a fixed action pattern.
b. classical conditioning.
c. imprinting.
d. operant conditioning.
e. altruistic.
c. imprinting.
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Refer to the figure above. Which of the structures in the figure causes the two strands of DNA to separate?
A) A B) B C) C D) D
What is the normal pH range for blood?
A) 7.38-7.42 B) 7-10 C) 1-14 D) 7.35-7.45 E) 7
An endemic species is one that
A. is found in only one particular place or region. B. requires a very large territory. C. has been cultivated by humans. D. can be used as an indicator species. E. has a disproportionate effect on its ecosystem.
When mast cells degranulate and release histamine, which of the following events may occur?
A) constriction of small blood vessels B) bronchial spasms C) increased mucus production D) both constriction of small blood vessels and bronchial spasms E) both bronchial spasms and increased mucus production