Describe the organism that scientists believe was responsible for changing the composition of the early atmosphere. what was it called and how did it change did it change the atmosphere? why was the change to the atmosphere so important?

How are the tortoises that darwin observed on the galápagos islands similar to the anoles that losos studied

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.

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere