Why do pigs wallow in the mud?

a. to keep clean
b. to cool themselves down
c. to get the nutrients they need
d. to get better sleep

will mark brainliest if correct!

b. To cool themselves down

Explanation:

the number of sweat glands is very less in pigs as compared to our body and some of the sweat glands do not work as well. wallowing in mud, help the pigs to regulate the body temperature and keeps their body cool when its too hot outside. The water in mud evaporates slowly  than the pure water .

A fact is a statement that is true and it can be judged objectively. So that, a fact is true and correct in all circumstances. An opinion, however, is a statement that based on a belief; it shows how someone feels. Indeed, opinion and fact are not synonyms. Both opinion and fact applied in education. Therefore, in research you can use both of them. An opinion is not always true. Therefore, it cannot be proven. It shows that the last option is not true. Opinion is not important than facts. Opinions can be based on facts. It shows that facts and opinions are not in opposition.