3. What types of damage can
introduced species cause?

They can change an entire habitat, placing ecosystems at risk, crowd out or replace native species that are beneficial to a habitat, and damage human enterprise, such as fisheries, costing the economy millions of dollars.

Explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).