Answer:
Protein
Explanation:
Protein calories is used as energy source when the body lacks fat or carbohydrates.
1. is A
2. is D
hope i help
The iris is the circular structure in the eye; if the iris is blue, then the eyeball is considered to be blue.
It can helps us to keep the human body healthy and continue to discover how to keep it healthy, and what keeps it healthy. The study of biology can lead to discovering how to prevent diseases. In the environment, if something is off, then people can use biology to see what is wrong and how to fix it.
