BIOL 3305 Lecture 43: notes-de-cours-cours-a-ecrit-a-la-m
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The sea otter was hunted to near extinction during the Pacificmaritime fur trade, and its range contracted to a small area inCalifornia. Since hunting was prohibited by international treaty in1911, this species has expanded its range to the north and southalong the Pacific coast. There is no evidence for the role ofevolutionary processes influencing this range expansion. This typeof range expansion is called:
A)
secular dispersal B) | ||
dispersal by diffusion C) | ||
adaptation
| ||
jump dispersal |
1 points
QUESTION 10
In what way or ways can Darwin
The response of a center-surround cell
a) | can be altered only by light falling into the center of the cellâs receptive field. |
b) | is not influenced by whether the light falls into the center of the cellâs receptive field or the periphery. |
c) | tends to be in one direction (e.g., increased firing) if the stimulation is in the center of the cellâs receptive field and in the opposite direction (e.g., decreased firing) if the stimulation is in the periphery of the receptive field. |
d) | is determined either by activation in the center of the cellâs receptive field or by activation in the periphery, but not both. |