Answer:
the total mass of organisms in a specific area or volume
Explanation:
hope this helps!!
Terrestrial ecosystems (tetrapods)
(B) All cars traveled at different speeds. Sorry if im wrong
Food is the most important source of chemical energy for living things. The chemical energy in food is converted, or changed, by the body into moving mechanical energy and heat energy. People have invented ways to use the chemical energy of substances to power machines.
