Scientists were able to determine the age of the earth from rock samples that were analyzed by what technique: fossil records, radio metric dating, extinction, geologic time scale

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

How many major plates cover the earth

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body