Is a shell biotic or abiotic?

What is the percentage of the maximum amount of water vapor the air could hold? What are the prevailing winds in Beaumont Texas? How do you get to alpha centari? What is a cyclic shape? What intestinal hormones CCK secretin GIP or motilin are responsible for creating peristaltic waves along the length of the intestines? Apoptosis begins with a cell's receiving a signal to die? What is the difference between a frond and a cone? What continent is located in the tropics and south temperate zones? What was Isaac Newton passionate about? What do autonomic reflexes control? What is so special about sassafras tree leaves? Is the water cycle an open or closed system? What is an observable fact or event? What state has lowest wind speed? Why are the leaves on your tibouchina yellow? How many miles can you drive 16 gallons? What year did the first hail storm happen? How were the criollos different from the peninsulares? If a man pushes on a crate with 10 newtons of force and Fred the goat pushes with him with another 10 Newtons of force what is the net force of Fred and the man on the crate? Is 1mg equal to 1million g?