7. Where do amino acids reside ?

Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.

Explanation:BRAINLIST :D

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.