Which mechanism helps prevent errors during DNA replication? A- Helicase enzymes unzip DNA to begin the process

B- Each nucleotide only pairs with one other nucleotide

C- DNA has a backbone made from alternating phosphate groups.

D- There are double and triple hydrogen bonds holding nucleotides together.

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data. % babies born at different weights % babies born in that category 6.0 6.5 in 50-555 70-75 80-8511 100-1055 which statement is a valid claim that could be made using the data in the graph? directional selection is occurring because the graph favors an extreme. mark this and retum save and exit next submit o type here to search