1. why do cats purr 2. why do we dream i will delete bad answers!

Cats purr when they are feeling major emotions such as happy (when you pet them) when they go to the vets office becacuse they are scared or worried they will get a shot. They also purr when the are tierd. So in concusion cats purr to express major emotions. Dreams are basically stories and images our mind creates while we sleep. Dreams can occur anytime during sleep. But most vivid dreams occur during deep, REM (rapid eye movement) sleep, when the brain is most active. Some experts say we dream at least four to six times per night. But the main reason why we dream is because it help us sleep when we dream most vividly during our REM sleep which is also then a person goes into the deepest sleep we dream because it help the body recover and it plays over out days thoughts and actions.

1. Cats purr when they are happy. However they sometimes purr when they feel threaten or frighten such as visiting the vet. (I miss my old cat :( )

2. we dream because well dreams are basically stories and images our mind creates while we sleep. Dreams occur anytime during sleep. But most vivid dreams occur during deep, REM (rapid eye movement) sleep, when the brain is most active. Some experts say we dream at least four to six times per night.  

I hope these were good answers :)