Which statement is not true of introduced species? a introduced species may out-compete native species. b introduced species generally disturb natural food chains. c an introduced species generally balance an ecosystem. d an introduced species may take over an ecosystem.

The answer is D. No one species can take over an ecosystem because naturally, all organisms and species are interdependent. For example primary producers (such as plants) are needed to harness the sun’s energy to bring-in energy into a food web. In addition, secondary consumers depend on primary consumers for energy, and etcetera.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.