A fossil whose age is determined by radiometric dating would be considered very old if only the smallest amount of radioactivity remained
Indicate whether the statement is true or false
TRUE
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True or False: Individuals in a group often exchange favors. This reciprocal interaction provides one explanation for the evolution of altruism
A. true B. false
In general, the form of energy that is least useful to living organisms is
a. chemical. b. electrical. c. heat. d. light. e. sound.
The brain can infer the pitch of a sound from the:a
number of hair cells that are stimulated. b. particular hair cells that are stimulated. c. intensity with which the hair cells are stimulated. d. intensity of the action potential produced by the stimulated hair cells. e. fluid movements of the semicircular canals
Blood pressure is the measure of pressure in a large artery and is recorded as two numbers (120/80). These numbers stand for the pressure
A. while the heart is contracting over the pressure while the heart is relaxed. B. while the subject is exercising over the pressure while at rest. C. while the heart is relaxed over the pressure while the heart is contracting. D. in the pulmonary system over the pressure in the systemic system.