Which of the following is characteristic of both weathering and erosion?
a
caused by burrowing animals
b
occurs with movement
c
occurs naturally
d
caused by the pull of gravity

Which description provides the best objective summary of the article in the passage?

In each transformation of energy , some energy what?

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.