Help plz I don’t know it

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Newtons view of arrangement of the universe

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.