Yes mercy killing is another way of saying euthanasia.
lolz yes
yes it is, as long as i know
Yes. Euthanasia involves killing somebody (more specifically, mercy killing - killing a person because he is suffering). The alternative is not to kill him.
yes
Yes. Animals are "put to sleep" all the time.
Yes, the killing of Candy's dog in "Of Mice and Men" can be considered a mercy killing. The dog was old, suffering, and no longer had a good quality of life, so it was a compassionate act to end its suffering. This event foreshadows later events in the story.
yes
yes. it can be im or iv
yes
Yes he did in 2006.
Yes if you know them then sure