Answer: Hydrogen bonds are created between the base pairs in DNA. Adenine pairs with thymine and cytosine pairs with guanine. Adenine and thymine create 2 hydrogen bonds while cytosine and guanine create 3. These bonds are fairly weak so that they can be broken when DNA is replicated (by an enzyme called helicase which unwinds DNA). However despite them being weak they do stabilize DNA's double helix structure as well.
Well I do know the answer to question #5 is temperature
Answer:
B: When severe weather occurs causing large waves to hit the coast.
Explanation:
when coastal flooding occurs, storms push the seasonal high tides towards the shore which causes the flooding
