"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).
Answer:
Humans cannot digest cellulose, but it is important in the diet as fibre. Fibre assists your digestive system – keeping food moving through the gut and pushing waste out of the body.
Explanation:
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HIV receptors are not found on the other cell types.