Which long-term environmental change could allow some organisms to flourish? drought
ice age
tsunami
large asteroid impact

pacing

Explanation:

Pacing is a study strategy in which a student may spread out the study material over a given number of study periods and work through the study material at his/her own pace.

This is the study pattern that Lauren is using to prepare for her Social Studies test. This method allows her to work through the material according to her own schedule in preparation for the test.