Question

An elephant has a long, powerful trunk. According to the ideas of Lamarck, how did the trait of long, powerful trunks develop in elephants ?
A Suddenly, after one elephant was born with a long, powerful trunk
B. Suddenly, after one elephant developed a long, powerful trunk as it grew.
C. Gradually, as elephants began mating with animals of other species that had long trunks.
D. Gradually, as generations of elephants continued to selectively use and develop their trunks.

Answer 1

Answer: D. Gradually, as generations of elephants continued to selectively use and develop their trunks.

Explanation: Lamarck believed that organisms pass on traits to their offspring that they had acquired through use or diuse during their lifetime.  In this example, the theory would be that over time, elephants used their trunks in such a way that they became long and powerful.