Question

In this lab, the three flocks of birds changed in numbers between generation 1 and generation 3. Why? Check all reasons.

The amount of food available increased and decreased.

If a flock’s beak type made it easier to pick up the available food, the flock grew.

If a flock’s beak type made it harder to pick up the available food, the flock shrunk.

Answer 1

All three.

- The amount of food available changed between generations, which altered survival pressures.
- Flocks whose beak type made it easier to gather the available food had higher survival and reproduction, so those flocks grew.
- Flocks whose beak type made it harder to gather food had lower survival and reproduction, so those flocks shrank.