Which snail population has the larger average shell thickness, the population from 1871, or the population from the 1980s?

the population from the 1980s had larger average shell thickness.

Explanation:

The snail population from the 1980s had larger average shell thickness.

The reason is explained as follows.

In the 19 the century , a species of crab called green crab moved to North America . They moved to Cape Cod region . They were predators and used to feed on snails . So a new species of snail evolved there which had thicker cover of shell to protect them from their predators. This was a burning example of process of evolution in modern times. The present generation of snails there now had thicker shell than their ancestors.

silty loam

hope this

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.