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Continental landmasses on opposite sides of the Atlantic Ocean

Earth’s atmosphere

The break-up of the supercontinent, Pangea, initially produced two smaller supercontinents.  The northern supercontinent is called

Which of the following major geologic layers is weak and plastic?

Cancer always originates from mutations in a stem cell.

How many nucleons neutrons are there in an atom of ? 

Additional mutations accumulating in a multistep process with growth over time describes the process of progression.

BRCA1 and BRCA2 are tumor suppressor genes that when mutated, may cause heritable (familial) forms of breast and ovarian cancer.

To which family of genes do replication error repair genes belong?

The goal of cancer research is to eliminate the underlying molecular cause of all cancer.