Answer:
What constitutes a healthy diet?
A healthy diet is one that helps maintain or improve overall health. A healthy diet provides the body with essential nutrition: fluid, macronutrients, micronutrients, and adequate calories. A healthy diet may contain fruits, vegetables, and whole grains, and includes little to no processed food and sweetened beverages.
Explanation:
A. Community.
This is because a community contains living this, and biotic means living.
D) laboratory experiments because every experiment needs a control and a variable.
Answer:
c. Hydrogen
Explanation:
Do I really need to explain...