How far will a bird have traveled in 13 seconds if it maintained a speed of 31 m/s?

Why do electron microscopes have higher resolving power than light microscopes?

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.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?