1) Social equality, harmony are necessary for human health. 2) Public cleanliness or sanitation or hygiene is very important for individual health. Hope this is helpful to you
Answer:
PARASITES.
Explanation:
At some point in their lives, many pets experience discomfort caused by external parasites such as fleas, ticks, or mites on their skin or in their ears. These parasites can be extremely irritating to pets and can cause serious skin problems or even carry disease.