Which layer of the atmosphere contains the protective ozone layer?
A. troposphere
B. mesosphere
C. thermosphere
D. stratosphere

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.

What does gradualism and punctuated equilibrium have in common

Explain two reasons you think it is important for scientists to search for new ways to treat cancer