A)destroyed as it is used.
B)evenly spread out over many organisms.
C)converted to many kinds of useful energy.
D)increased as you go up the energy pyramid.
E)converted to heat,which is no longer useful.

A)possible only if you are a cannibal.
B)possible since carbon cycles through the biosphere.
C)impossible since carbon can't enter a living system more than once.
D)highly unlikely since carbon is always tied up in molecules in organisms or minerals.

A)Denitrification removes nitrogen from the atmosphere and converts it to a form that plants can use.
B)Nitrogen fixation can occur in aquatic systems or in soil bacteria.
C)Nitrification occurs as ammonium is converted to nitrate.
D)Nitrification occurs as nitrogen gas is converted to nitrate.
E)Both ammonium and nitrate ions are highly water-soluble