The Short Answer:
High and low tides are caused by the moon. The moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the moon and the side farthest from the moon. These bulges of water are high tides.
I would put eater and transportation.
the first plants and anthropodes appear on land approximately about 470 million years ago
Answer:
1.Atria push blood into the ventricles
2.Venticles push blood out of the heart.
