Which statement concerning ecosystems is correct?

A) Stable ecosystems that are changed by natural disaster will slowly recover and
may again become stable if left alone for a long period of time.

B) Competition does not influence the number of organisms that live in ecosystems.

C) Climatic change is the principal cause of habitat destruction in ecosystems in the
last fifty years.

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.