30. Bumps on the roots of plants where
bacteria live.
The plants include clover, beans,
peas, alfalfa, and peanuts.
31. How is nitrogen fixation a
necessary part of the
nitrogen cycle?
32. Most organisms cannot use free
nitrogen in the atmosphere.
Nitrogen fixation combines free
nitrogen with other elements to form
compounds that organisms can
use.
33.
34. Explain how the movement
of matter through an
ecosystem is different than
the movement of energy
through an ecosystem.
35. Matter can be recycled over and
over again. In contrast, once
energy has moved from the
producers to the consumers and
then the decomposers, it cannot be
recycled. A new supply must be
“captured” by the producers.
