True or false? a person with a relatively small number of cones in the retinas may have trouble distinguishing colors.

What types of energy transfers and energy transportations are involved in the domino chain reaction?

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins