The upper limit of an organism's distribution in the rocky intertidal is usually determined by:
a. grazing effect.
b. predation.
c. pH.
d. desiccation.
e. competition.
D
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Which of the following best describes a "species"?
a. a group of individuals producing similar vestigial structures b. a group of individuals developed through selective breeding c. a group of populations with homologous structures d. a group of populations that evolved independently e. a group of similar fossils
Prenatal diagnosis is available for all of the following disorders EXCEPT
A) Down syndrome. B) AIDS. C) cystic fibrosis. D) sickle-cell anemia.
When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms?
a. Natural selection b. Genetic drift c. Gene flow d. Random mating
Which 3 are true of dominant and recessive traits?
What will be an ideal response?