The snail in layer E of image 1 is a previously unidentified species. How can scientists determine the relative age of the fossil?Answer in a short and clear answer, use your own words

The scientists will use Relative dating. It is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.