Relative dating uses to estimate the age of a fossil.
A. radioactive isotopes
B. depth within rock layers
C. embryonic structures
D. a molecular clock
E. structural features
B. depth within rock layers
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IgG is the:
a. first antibody produced when an invading microorganism is initially encountered. b. antibody that is associated with various parasitic infections. c. antibody that is secreted in various body fluids and primarily protects those body surfaces lined with mucous membranes. d. second antibody produced when an in-vading microorganism is initially encoun-tered and the most abundant.
The anterior pituitary responds to hormones produced by which organ?
a. pancreas b. adrenal glands c. hypothalamus d. thalamus
Which of the following is not a legume?
A. alfalfa B. peas C. corn D. soybeans E. beans
When a sudden change in the environment, such as a flood or fire, reduces the size of a population, the survivors' collective gene pool will be only a limited representation of what was present before the disaster. This phenomenon is called:
a) the Hardy-Weinberg effect. b) the genetic load. c) the founder effect. d) the bottleneck effect. e) the mutation effect.