What is proof that all living things have a common ancestor?

What are two ways in which waves erode the land?

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Grasses--> mice--> cats--> coyotes suppose 10,000 units of energy are available at the level of the grasses. what is the total number of energy units lost by the time energy reaches the coyote?