The noise of thunder is caused by ___ A. Rapid of expansion of air
B. Clouds rushing past each other
C. Rain hitting the ground
D. Two air masses colliding

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Greenthe fossil record is the history of life recorded byhuman observationgod. climatologists. remains of the past.