Answer:
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
I spend the day at the window, go to the table for meals, and hide at night. What am I?
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. What am I?
Before Mt. Everest was discovered what was the highest mountain in the world?
Many people own a copy of me. Without me the world would fall.
What scientists might call your pooch.