Answer: Aquatic fossils would be found near the bottom of the core sampleRock cores provide valuable sources of information to geologists because it presents very accurate measurements of porosity of the rock. If a geologist obtained the rock core from a hillside and found aquatic fossils near the bottom of the core sample, he can conclude that this hillside was once covered by a body of water.
Yes there is, there is the cycle which trees and plant organisms produce oxygen, and homes animal organisms which can be beneficial to decomposition and other things.
