In an experimental procedure, the researcher measures changes, such as cell growth rates, numbers of patients with a disease, etc. in response to factors manipulated at the beginning of the experiment. This measure of change in response to the initial conditions is the
A. dependent variable.
B. standardized variable.
C. independent variable.
D. control group.
E. Both dependent variable and standardized variable are correct.
A. dependent variable
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The __________ circuit carries blood from the heart to body tissues, and then returns it to the heart. Fill in the blank(s) with the appropriate word(s)
Radioactive isotopes are used in dating materials from the distant past. Which of the following statements about radioactive dating techniques is true?
A. It gives the general ages of rock strata. (±1 million years). B. It gives exact ages of rock strata. (± 1 year). C. It uses a technique in which the degree of radioactive decay is measured, the younger the rock the more radioactive decay. D. It uses a technique in which the degree of radioactive decay is measured, the older the rock the more radioactive decay. E. It does not work well with fossil remains that have not absorbed radiation.
Answer the following statements true (T) or false (F)
1. Temperature tends to decline with longitude. 2. Land next to the sea has more variable climate than land farther from the sea. 3. 4.
A population being separated by a river or mountain range is an example of ___________ isolation, which over time may result in speciation.
Fill in the blank(s) with the appropriate word(s).