Scary Moment

Question: Insects have been disappearing for the past month. You are in a lab studying why and how this is happening, but the main door closes and you are locked inside. There are three doors in front of you that lead to freedom. Door 1: Hungry eating plants Door 2: Blood-thirsty vampires Door 3: Coldwater which you would get hypothermia quickly. Which door would you choose?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: During what month do people sleep the least?

Question: When is 99 more than 100?

Question: What can be broken but never forgotten?

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