The study of the frequency and distribution of disease in defined human populations is known as .

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.

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Describe how a student should adjust the microscope to see the cells on a slide more clearly?