【单选题】Understanding how nature reacts to climate (气候) changewill require checking key, life cycleevents-flowering, the appearance of leaves, the first frog calls of the spring-all around theworld. But ecolo...
A.
study animal behavior. all year round
B.
invite citizen scientists to do scientific research
C.
collect information on the life cycles of common plants
D.
help ecologists learn about wildfires in western United States