Which mechanism helps prevent errors during DNA replication? ОА
Helicase enzymes unzip DNA to begin the process.
B
Each nucleotide only pairs with one other nucleotide.
С
DNA has a backbone made from alternating phosphate groups.
D
There are double and triple hydrogen bonds holding nucleotides together.

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.