If it has valves then it is a vein.
<span>Scientists are looking for a way to create cheap, safe, and sustainable energy.
Nuclear fusion is the process by which two atoms rapidly collide at each other forming a new nucleus. The energy of colliding and synthesizing has intrigued scientist into believing that this could be one of best sources of renewable energy. </span>
The dominant ones. Whatever has been gained through evolution in adaptation to their specific environment.
Answer:
1 answer is B
2 answer is c
3 answer is a
Explanation: hope this helps if it not right pls tell me
