Are the ocean and present atmosphere "leftovers" from the original atmosphere and earth?

Which statement about dna replication is true? a. eukaryotes only have one circular chromosome that unwinds at multiple locations. b. eukaryotes can only replicate one segment of a chromosome at a time. c. prokaryotes can only replicate their single circular chromosome in the nucleus. d. prokaryotes only have one origin of replication to initiate replication.

In the diagram below, the northern hemisphere would be in what season at position a a. fall b. winter c. summer d. spring

If animal agriculture was eliminated, how much grain would become available for human consumption?