D. having trouble relaxing
Answer:
the study of the structure, reaction, and composition of different kinds of substances
Explanation:

If the cell membrane did not allow nutrients to pass through, the nucleus would be unable to send out instructions. Additionally, the mitochondria is the powerhouse of the cell.
Positive family ties would lead to a greater sense of responsibility for one's self and one's family, so people with positive family ties are more motivated to engage in behaviors that lead to better health.
Answer:
Find a perfect place to tell him or you wait for him to say something.
Explanation:
6 years is a long time tho so that means you guys are best friends soon he will tell you and make sure to wear something xtra nice