The lungs and respiratory system work closely with the system to make sure oxygen reaches all the cells of our body.

Acladogram is a branching diagram that represents suggested evolutionary relationships among organisms based on the presence of unique traits. a scientist discovers a new organism that lacks limbs and does not have a true backbone. the organism lays eggs to produce offspring and has a cartilage-like rod known as a notochord running along its dorsal surface. on the cladogram below, select the species to which the newly discovered organism is most closely related.

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

What effect does plate tectonics have an organic evolution