In Paramecium, the function of a contractile vacuole is to
A. maintain water balance in the cell.
B. All of the answer choices are correct.
C. store nutrients.
D. store toxins.
E. provide movement.
A. maintain water balance in the cell.
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Methanogens can live only in ________ environments.
A. microaerophilic B. aerobic C. anaerobic D. All of the choices are correct.
Natural selection results in organisms perfectly adapted to their environments
Indicate whether the statement is true or false.
The ________ birthrate is expressed as the births per 1000 individuals per unit of time
Fill in the blank(s) with correct word
Your friend has a dog Rex that she feeds every night immediately after she gets up from the dinner table. You are dog-sitting one weekend and you decide to keep Rex at your house rather than leave him alone in hers. After you eat dinner and get up to clear the table, Rex starts salivating profusely and runs to his food bowl. Rex's behavior is an example of:
A. an automatic reflex. B. a conditioned response. C. an irrelevant response. D. the anticipatory response. E. permanent conditioning.