Answer:
Adaptation to there environment
Strong and flexible I think
External fertilization is the correct answer.
Liquid water, which is necessary for life as we know it, continues to exist on the surface of Earth because the planet is at a distance, known as the habitable zone, far enough from the Sun that it does not lose its water to the runaway greenhouse effect.
You can rub a permanent magnet against something else that can be magnetized, like a paper clip.
