Summative Assessmen, Help

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.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

What are atoms of the same element with varying number of neutrons