1) in biology, a trait that arose in an ancestor and is passed along to its descendents is referred to as
a. derived character
b. taxonomic group
c. molecular clock
d. physical similarity
2)which of the following idea is supported by darwins observation of locals variation amoung tortoises in the galapogos island>
a. artificial selection
b. adaptation
c. acquired characteristics
d. tendency towards perfection

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.