Because all those energy sources are natural and will always be there, when ever there is a need for extra energy.
Viruses, bacteria, fungus,Protozoa and worms
The answer is <span>2 can be made by the animal's body from other substances.
Both essential and nonessential amino acids have essential roles in the organism. Nonessential amino acids got their name because they are not an essential part of the diet. The main difference between these two groups of amino acid is that essential amino acids cannot be made by the animal's body and must be ingested in the diet unlike the nonessential amino acid which can be made by the animal's body.</span>
3 asteroid that hit earth
Answer:
c
Explanation:
because if you look at Darwin's change of evolution finches like these can break walnuts and pick at it because they have strong beaks
