It is believed that phototrophy arose approximately 3. 3 billion years ago in.

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.

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Which part of cellular respiration must occur before any of the other steps can occur