A
A is correct for this problem
Topoisomerase is the enzyme that can be added to correct the untwisting that is led to strain ahead of the replication fork.
All rock on the ocean floor is less than 180 million years old because <span>reverse polarity removed older rock strips magnetized in a different direction. Also,</span> the oldest parts reach the continental crust and then the ocean floor sinks beneath the continental crust, into the mantle.
67 million years ago in the form of phyollths (small sllica flecks in grass that make it difficult to digest)
