Which of the following can be accurately said about climax communities?
a. climax communities are always stable.
b. restoration of the original climax community may not always happen.
c. restoration of the original climax community is always achieved at the same rate.
d. climax communities are always uniform.

D. Climax communities are always uniform.

An ecological succession involves a series of changes that occurs in the biotic community of the ecosystem with respect to changes in the abiotic factors (temperature, soil, sunlight, rainfall) and time until the ecosystem attains uniformity and stability. A climax community is the last stage of ecological succession where no further changes takes place in an biotic community inhabiting in the ecosystem and there will not be drastic changes in the abiotic factors (temperature, sunlight, soil). On reaching upto climax community, the simple communities are replaced by those of more complex communities which are final communities inhabiting in an ecosystem. Therefore, climax communities are always uniform.

a physical change is being made.