20 points a population of mussels was observed in a particular ecosystem. it was found that crabs preferred these mussels as their favorite food. few mussels developed a thicker shell to protect themselves from crabs found in the region. which three statements does this adaptation suggest? a. a change in the environment led to a new distribution of traits in a population. b. the trait of shell thickening underwent natural selection. c. the trait for shell thickening will not be selected by future mussel generations. d. half of the mussel population developed the trait while the other half did not. e. mussels with the shell thickening trait had a greater chance of survival.

The correct answer is C (The trait for shell thickening will not be selected by future mussel generations)

The difference in thickness of shells is an advancement to adjust from the crabs and survive.  Further clarification can be perused on the exploration directed by  Aaren Freeman and James Byers.

It was found out that crabs discharge synthetic substances that are distinguished by mussels. Thus, mussels have a physical response activated by the synthetic substances which lead to the thickening of their shells.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.