21: 4 and 15
22: 5
23:<span>1, 2, 3
I hope this helps</span>
A person usually had two kinds of thinking, the is the way of concrete thinking and the other one is through abstract thinking. By concrete thinking, a person will just be able to rely on facts that surrounds that person. This kind of thinking doesn't go beyond facts or not be able to think out of the box. Concrete thinkers always generalized the concept of all things. The abstract thinker on the other hand, they tend to understand things through different meanings, they look things with different perspective. In simplest terms, Concrete thought is based on facts while abstract thought is based on ideas.
<span>Cover. Wear a hat or other protective covering to prevent body heat from escaping from your head, face and neck. ...Overexertion. Avoid activities that would cause you to sweat a lot. ...Layers. Wear loosefitting, layered, lightweight clothing. ...<span>Dry. Stay as dry as possible.</span></span>
It contains dopamine precursors like l-tyrosine which are useful in producing energy
