Evidence.
This are the two things explanations need: testability and evidence. Both of them are very important but evidence, I'd say, is the most important factor since it supports the claim in a remarcable way.
Hope it helped,
BioTeacher101
Answer:
maritime polar
Explanation:
the precipitation shows signs of a maritime polar
Helicase is the enzyme that unwinds DNA during replication
B, circulatory and respiratory