Question

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.
done

Explanation:

This relates to evolutionary responses to selective pressure (scarcity of their primary food source, fruit).

1. Flock X may switch to other foods to survive.
2. Migrating to find their preferred food (fruit) is a common adaptive behavior.
3. If they can't adapt, their population will decline due to lack of resources.
4. Flocks Y and Z, if they use different resources or are better adapted, would face less competition and their numbers could rise.
5. Mutation is a random genetic change, not a deliberate "try" by the flock, so this is not a valid response.

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.