The extremities of an animal's body include mostly bone

What is thought to have caused the mass extinction at the end of the cretaceous period?

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.

Number and variety of living organisms includes genetic, species, and ecological types