In environment a, trees are growing back and some of the larger animals are returning to a logged forest.

in environment b, lichens and moss are growing on a rocky mountainside that was scraped bare as a glacier retreated. now, hundreds of years later, some small grasses, shrubs, and animals live there.

which statement best describes both situations?

a) environment a is undergoing succession, and environment b is not.

b) environment a is not undergoing succession, and environment b is.

c)both environments are undergoing the same kind of succession.

d)both environments are undergoing succession, but different kinds.

Both environments are undergoing succession, but different kinds.

Explanation:

The correct answer should be D) Both environments are undergoing succession, but different kinds. The different kind is in Environment A, the Environment is recovering from a rapid change, which in that case was logging. In environment B, the environment is always undergoing a change, whether its a fast, rapid change, or a slow change. 

cell regulation is conducted by special proteins.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.