Question

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

Explanation:

Drought and ice - age are long - term environmental changes. Some organisms adapted to dry conditions can flourish during drought, and cold - adapted organisms can thrive during an ice age. Tsunamis and large asteroid impacts are short - term catastrophic events that usually cause mass destruction rather than allowing organisms to flourish.

Answer:

A. drought, B. ice age