Most of earth's fresh water is _____
a. in lakes and streams c. frozen as ice
b. in aquifers and soil d. in bodies of organisms.
C
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DNA replication involves the synthesis of an RNA primer on one strand of the DNA
Indicate whether the statement is true or false.
The male sex hormone testosterone is secreted in response to a hormone secreted by the _____
a. testes c. pituitary gland b. ovaries d. pancreas
Human gene therapy
A. includes the insertion of genetic material into human cells for the treatment of a genetic disease. B. has been used in a trial to treat familial hypercholesterolemia. C. has been used for treatment of children who have severe combined immunodeficiency. D. All of the choices are correct.
Mutations are important because they do what?
(A) provide variation that can result in evolutionary change. (B) occur in response to environmental demands. (C) are always beneficial in the individuals affected by them. (D) usually provide an individual with increased reproductive rates.