When a person's teeth are being x rayed, other body parts of this person are covered with a protective lead blanket to prevent?

Look at the photo of the leaf. which term best describes this leaf?

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

Can a trait be both polygenic and have multiple alleles? explain why or why not.