Apparently it is ATP as deduced from the last line of text and no model to refer to.
Answer:
c.building immunity towards diseases
I believe the answer would be <span>The musculocutaneous nerve innervates the flexor </span>muscles<span> of the </span>arm<span>, including the biceps brachii and brachialis </span>muscles<span>. ... Along the anterior of the </span>forearm<span>, the median and ulnar nerves </span>supply<span> nerve signals to the </span>skin<span> and to the flexor </span>muscles<span>of the </span>hand<span> and fingers.</span>
<span>What is the approximate age of our solar system?
</span>b. 4.6 billion years
