Answer:
I think it is d
Hope this help and I'm sorry if I'm wrong.
The protons have to stay the same
<span>Certain stretching techniques increase blood flow to
your muscles, while other techniques actually restrict blood flow. Stretching
may seem a little not essential. This activity can make more athletic
performance and decrease your risk of injury. Yet, not all stretches are
created equal. </span>
Answer:
This is abut the water cycle I believe.
Explanation:
I don't know for sure but it looks like it is.