What is a zygote? A. A fertilized egg cell that has not yet divided

B. A group of about 100 cells that forms from the fertilized cell

C. An organ that holds and protects the developing baby

D. An organ that supplies oxygen, nutrients, and water to the
developing baby

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.