The retina uses visual fields to recognize objects in the environment.
a. true
b. false; visual pigments are most important
c. false; contrast is the most important feature.
d. false; absolute light intensity is more important
e. false; ganglion cells are all that’s needed

Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

What causes temperature extremes in the desert

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen