Atrain accelerates at a rate of 2.5 km/hr/sec. during the acceleration period, its velocity changes by 55 km/hr. choose the exact time of the train's acceleration.

a. 1,200 s

b. 22 hr

c. 22 s

d. 0.045 s

Marianne is comparing two animals: a fruit fly and a fruit bat. she asks, "do a fruit fly and a fruit bat share a common ancestor in their evolutionary history? " according to evolutionary theory, what is the answer to marianne's question?

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How does secondary succession differ from primary succession?