The gravity of the
is the biggest factor in determining the ocean tides.

The moon's gravitational pull is strongest at the sub-lunar point, which is the point on the Earth where the moon is directly overhead. ... At this point, lunar gravity causes water to bulge toward the moon, creating high tides; it also pulls water to that spot from other areas, creating low tides.

Sexual Reproduction- Causes genetic variation which results in more advanced/adapted species to that specific environment