The is the total number of organisms that an ecosystem can support.. a.. tolerance range. b.. carrying capacity. c.. competitive exclusion principle. d.. population.

B. carrying capacity

Under natural conditions, most populations will stabilize at a level known as the carrying capacity of the ecosystem. The carrying capacity is the maximum number of organisms that an ecosystem can support on a continued basis.

A: rachel carson :

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.