Question

suppose that a plant disease kills all the fruit. the change could become a selective pressure on the birds. the birds shown above have beaks with three different shapes and sizes. these genetic variations in the beak each appeared initially due to mutations. look at the three beaks. which flock’s birds have beaks that seem most likely to be able to pierce a piece of fruit? flock x check all possible effects of this selective pressure. flock x may try to eat other foods. flock x could migrate in search of fruit. flock x could slowly decrease in number. flocks y and z could benefit and increase. flock x could try to mutate.

Explanation:

When a plant - disease kills all the fruit, Flock X, which is adapted to eating fruit (as its beak is most suitable for piercing fruit), may try alternative foods or migrate to find fruit. If it fails to adapt, its population may decrease. Flocks Y and Z, which are not as dependent on fruit, may benefit. Mutations are random and not a conscious action, so Flock X cannot "try to mutate".

Answer:

Flock X may try to eat other foods.
Flock X could migrate in search of fruit.
Flock X could slowly decrease in number.
Flocks Y and Z could benefit and increase.