What kind of energy can be transferred?

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

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.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?