<span>They use a chemical energy called ATP</span>
Answer:
Productivity within an ecosystem can be defined as the percentage of energy entering the ecosystem incorporated into biomass in a particular trophic level. Biomass is the total mass, in a unit area at the time of measurement, of living or previously living organisms within a trophic level.
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Answer:It is a gene that has thousands of different forms.
Explanation:
The answer is letter A.
<span>
The skeletal, cardiac, and smooth muscles are the different muscles that
make the human body. They are responsible for moving the body internally and
externally. Movements of the muscles are classified as being voluntary or
involuntary. Both cardiac and smooth muscles are involuntary muscles that
contract without the need for conscious thought. These are found in the heart
and organs like the intestines responsible for digestion. Skeletal muscles are
called voluntary muscles because they contract upon the brain’s commands or
signals like the muscles of the arms, hands, and feet. </span>