Because they take food and make energy that the rest of the cell can use.
One possible formula is
<em>Weight = (mass of the object) x (acceleration of gravity where the object is).</em>
Yes indeed, that is a true statement. Truer words are seldom written, and I could not agree with you more.
In case you are asking a question, I can kind of see how this might be a question if there is a blank after "... the change in ..." that is to be filled with one or more new words.
If that is the situation, then the blank can be filled with "frequency or wavelength" .
Solar Radiation, Orbital Distance, Air Pressure, and the Abundance of water.
