The early atmosphere of Earth had no oxygen, while the modern atmosphere contains significant amounts of this gas. What is the primary reason for this change?

In order to clone adult animals, scientists typically begin with a(n)

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

What are the pros and cons of quadrat sampling?