How can introducing a plant or animal from one ecosystem into another ecosystem cause major problems

Which measure of an earthquake depends on how close you are to the focus?

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

Based on the number of offspring they produce at one time organisms are classified into two categories many offspring at once and a few at a time sort the carry sticks based on the category they describe