Question

bird beak variation
bird beak size is often related to the type of food the bird eats and the size of the food source. smaller - beaked birds eat seeds. food that needs large - beaked birds are better able to eat larger seeds, while large - beaked birds eat larger seeds and nuts and fruits.
an environmental change occurred that resulted in a reduction in one type of food, namely small seeds. the change caused a shift in the distribution of beak sizes observed. the graph shows the distribution of birds of various beak sizes before and after the change.
question: how can an environmental change cause a shift in the traits of a population?
a. an environmental change can cause organisms to choose traits that are more favorable.
b. an environmental change can make some organisms better suited for survival than others.
c. an environmental change can cause some organisms to change their behaviors and quit reproducing.
d. an environmental change can make organisms that are less suited for survival reproduce more rapidly.

Explanation:

Environmental changes can impact the survival - fitness of organisms. Those better adapted to the new environment are more likely to survive. This is based on the principle of natural selection. For example, in the case of bird beak size, a change in food source can favor birds with certain beak sizes over others.

Answer:

B. An environmental change can make some organisms better suited for survival than others.