Answer:
The answer is c.
Explanation:
I hope this helps answer your question.
"From 10AM to 4PM are the most dangerous hours for exposure to the sun."
The first two don't make any sense. As for SPF, the FDA minimum is 15 but the recommended minimum is 30. 10AM-4PM are the peak sunlight hours, generally (unless you live in Antarctica of course).
Explanation:
our chemical barriers protect almost every infection we can get in our body
<h3>The blood in the pulmonary artery is going to the heart to collect oxygen, and therefore has a low content of oxygen. So, the blood in the pulmonary artery is a violet colour because it has low oxygen. The blood in the pulmonary vein is oxygen rich, and so it gives a scarlet</h3>

Being unable to sit still, especially in calm or quiet surroundings.
constantly fidgeting.
being unable to concentrate on tasks.
excessive physical movement.
excessive talking.
being unable to wait their turn.
acting without thinking.
interrupting conversations.