What is a sentence about hertz in science

Don’t copy and paste from ggle

hertz is the unit of frequency, frequency means the number of waves that pass a fixed point in unit time; the number of hertz equals the number of cycles per second.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.