According to the principle of stratigraphy, which layer in a rock formation would you expect to be the oldest

Which term refers to the total dollar value of the goods and services produced in a country in a year?

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts

Witch type of microscope is used to view very small cell components like proteins and dna?