Which is the ability to move a joint through its entire range of motion?

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.

If element x has 99 protons how many electrons does it have

Match each scenario to the form of energy it represents