Name the nutrients required for the body​

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.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

How do cracks affect the rate of weathering?