Succession begins when the first organisms, usually lichens, colonize . A. a meadow B. a developed habitat C. a bare rock D. a mature ecosystem

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

The carrier molecules of the electron transport system are located in the

If a cell is placed into a hypertonic environment, what will happen to it ? a)it will shrink or shrivel b)nothing c)it will burst d) it will expand or enlarge