PLEASE HELP! What situation is an example of artificial selection?
Select one:
a. More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory.
b. Female bluegill fish prefer to lay their eggs in the nests of larger male fish.
c. Albino deer or rabbits have a low survival rate in nature, because it is easy for predators to spot them.
d. Penguins with higher body fat tend to survive nesting in the Antarctic winter, while leaner penguins often die.

A

Explanation: In artificial selection, humans determine what traits get passed down. For B, humans play no role in where the fish lays her eggs. For C, humans aren’t the ones killing the deer and rabbits — natural predators are. As a result, humans play no role. For D, humans also play no role in deciding which penguin lives.

For A, however, humans have caused African elephants to naturally lack tusks because of their hunting — this wasn’t natural or due to the environment. This was due to human intervention. As a result, it is artificial selection.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs