Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.
If i would have to make an educated guess, i would say C.
We can tell from their structure that fatty acids are a good source of energy because of their large number of carbon-hydrogen and carbon-carbon bonds that they contain. Most fatty acids have straight chain compounds with an even number of carbon.
Answer:
1. Air warms, becomes less dense, it rises
2. Air cools down, increases density (becomes denser), it sinks
A catalyst increase a chemical reaction, therefore making the answer B. Promotes a chemical reaction.
Hope I could help! :)
