What use would a plant have for pain?
Animals feel pain because it stops them from touching painful things and makes us cautious of dangerous things. A plant can't move apart from basic growing, and feeling pain wouldn't do anything. Doesn't seem to make sense to evolve to feel pain when you can do nothing about it. Then again, I don't get why childbirth hurts mammals, either.
A virus. If it weren't for that damned thing, the mother's body would reject the foreign DNA and it would be impossible for the egg to develop inside her. Of course, that would also mean most of the animals we're familar with wouldn't have existed *ever*...
Also, we only metabolise oxygen 'cause of a bacterium.
I like meat, plain and simple.
However, I do respect the decision of those who are vegetarians...except for those who do eat fish because they claim it isn't meat. Because fish is so obviously meat.
Those aren't vegetarians, they're piscatarians. Wish they knew the proper word to describe themselves :-\.