Why is an estuary considered an intermediate biome?

Which characteristics are typical of a human population in the postindustrial stage?

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