Before there was life on earth, which gas was absent from the ancient atmosphere?

a. ammonia
b. methane
c .nitrogen
d. oxygen

How are organisms in the domain eukarya different from those in the domain archaea? o a. eukaryotes have a cell wall. o b. eukaryotes have mitochondria. o c. eukaryotes have more than one cell. o d. eukaryotes have dna. submit

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?