Four chambered heart keeps oxygenated and deoxygenated blood separate and has double circulation while three chambered heart has a single circulation. Two chambered heart only has single atrium and single ventricle
I think that that the answer should be C asexual reproduction of a single-celled organism
Answer:
Rocky Mountain wood tick, Brown dog tick, Cattle fever tick, Tropical bont ticks, Asian longhorn tick
Explanation:
Answer:
Cyanobacteria are responsible for first adding oxygen to the Earth's atmosphere.
