What the answer to this question?

Question

Ecological succession occurs when an existing ecosystem is changed by an event such as flood or fire what is the result of ecological succession?

a) Different populations of plants and animals replace the previous ones.

b)populations present before the event return to the area in greater numbers.

c) the ecosystem lacks consumers

d) the ecosystem contains only plant populations

Answer 1

the answer is A.  In general, communities in early succession will be dominated by fast-growing, well-dispersed species. As succession proceeds, these species will tend to be replaced by more competitive species.

Answer 2

a--different populations of plants and animals replace the previous one.  The word succession indicates that other groups succeed the first because conditions have changed and they can be more successful in the new ecosystem.