Answer:
A.Hot air rising,cold air sinking
Explanation:
Hot air rises in a confined or closed space.That is one of the reasons why firefighters have some people crawl on the flour to get out. the smoke is hot air so it rises to the ceiling of the room, while cold air stays lower.
Calcium Oxide is used in insecticides as an ionic bond. It's known as quicklime. CaO
Flourine reacting with ammonia will cause nitrogen is an example of a covalent bond.
Lipids are long chains of fatty acids. An easy way to remember this is to remember what i liposuction is! A liposuction is a procedure many people get to remove fat from certain areas of their body - and it’s one of the most common plastic surgery procedures. Lipids and Liposuction both start with Lip/Lipo because both roots mean fat!