Which of the following occurs during the ecological succession of an ecosystem?
a. an ecosystem reaches a final, unchanging stage.
b. changes occur that are caused by organisms outside the ecosystem.
c. living organisms modify their environment a little at a time.
d. parts of communities split off to form new communities.

The answer is c. Living organisms modify their environment a little at a time.

The purpose of succession is for an ecosystem to reach balance state right after it is formed or after it is disturbed by man or some disasters. It will increase biodiversity and help to prevent the desertification. Living organisms modify environment a little at a time. By modifying it, they make the environment more suitable for the new species to enter the community.

Lesson 8: Ecosystem Changes Over Time

1.What is one difference between primary and secondary succession?

A. Secondary succession begins on soil and primary succession begins on newly exposed surfaces.

2. A tropical rain forest may be unable to be returned to its original climax community after which of the following disturbances?

B. Clearing and Farming

3.  Which of the following occurs during the ecological succession of an ecosystem?

C. Living organisms modify their environment a little at a time.

4. A parking lot paved with asphalt is abandoned. Describe the parking lot 5 years after its abandonment.

B. Large patches of asphalt remain bur small plants grow in many cracks in the asphalt

5.Rank the following disturbances to a forest area in order of the length of time (shortest to longest) needed for recovery of the forest.

B) Ice Storm, Tornado, Logging.

69 is the correct math for the amino acids