1. Protein Coat 2. Nucleic Acid
The density decreases because you are coming closer to the atmosphere and away from the center of the earth
Fossils can be found in the Earth's crust.
The crust is the thinnest layer of the Earth. The fossils are most probably be found in this layer because it is the outermost layer. Also, the deeper the layer of the Earth, the higher the temperature that it has, and it probably cannot preserve the fossil.
Biology: study of life
hope this helped!
p.s. can i please have brainliest? :)