Explanation: The reason why many scientist, and well informed people say "The History of planet earth is full of change", is because that planet earth has colliding continents, and such beings of evolution right now we think we are the only living BEINGS in the universe, so the reason why The history of planet earth is full of change is colliding continents one day New York will be with Europe, and new governments will start forming, and sooner than later humans will start to evolve onto what is "The New world"
It is the natural/genetic ability of an organism to avoid or repel attack by biotic agents (pests etc.) or to withstand the effects of abiotic agents example (chemicals).
