7. Consider the idea of density-dependent factors that cause stress to ecosystems. Which of the following is not a density-dependent factor that causes stress to an ecosystem?

compost can be added to topsoil as a:

pesticide

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

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the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.