Answer:
A food is something that provides nutrients. Nutrients are substances that provide: energy for activity, growth, and all functions of the body such as breathing, digesting food, and keeping warm; materials for the growth and repair of the body, and for keeping the immune system healthy.
Explanation:
Answer:yes
Explanation:
Impure substance is a mixture of 2 or more molecules
The answer could possibly be natural selection or survival of the fittest
