How do single-celled decomposers get energy?
a.
they make their own food.
b.
they use a process called budding,
c.
they feed on living organisms.
d.
they break down dead organisms.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.