Good Riddles

Question: What is green, fuzzy, has four legs and if it fell out of a tree could kill you?

Question: A man named Tom goes to a party. Him and three guests go into a back room to play some games. A few hours later the four of them are discovered dead. One was beaten with a shovel, another had a drill bit in his head, and the other had been clubbed to death. Tom has no marks on his body.

How did he die?

Question: A computer walks up to two stores, one called '1', and one called '0'. Which does it choose?

Question: I am duplicate of you, but only lighter. What am I?

Question: Surrounded by life , yet life is its biggest enemy. But without life there is no need for it to exist. What is it?