Complex tool use, spoken language, and complex foraging strategies were all important hallmarks of human evolution. Current thinking is that each of these was a consequence of:
A. bipedalism and freeing the hands from
locomotion.
B. increasing body size and release from
predation.
C. increasing brain size and the development
of culture.
D. sexual selection.
E. None of the above.
A
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Organisms that obtain energy and nutrients by eating either living or dead organisms are called
A. producers. B. All of the answer choices are correct. C. autotrophs. D. consumers. E. plants.
Answer the following statements true (T) or false (F)
1.A graded potential allows for variable, rather than all-or-none responses, in neurons. 2.During an action potential, sodium ions pour into the cell. 3.The purpose of the nodes of Ranvier is to start nerve impulses. 4.A nerve impulse does not spread backwards because of a refractory period in which the membrane reestablishes its resting potential and cannot generate another action potential. 5.The reason that we can tell light from sound is because different neurons transmit different stimuli.
According to genetic evidence, the migration of H. sapiens out of Africa replaced other human populations, including
Neanderthals and H. erectus, leading to their extinction. a. True b. Fals
Random movement from a region with higher concentration to a region with lower concentration in the cell is called ________
Fill in the blank(s) with correct word