The retina is a photosensitive tissue that contains the special photoreceptor cells. what is the purpose of these photoreceptor cells?

a. to convert light to electrical impulses

b. to invert the image right-side up again

c. to focus light waves on the back wall of the eye

d. to convert black and white into color

4.06 hc)a five-year review of threats to the southern resident orca population of the united states concluded that the top threats were prey availability, contaminants, and effects from recreational and whale watching vessels. further down the list are oil spills, disease, and effects from commercial vessels not targeting whales. how might this list be different if it were for transient whale populations, which have a larger average population size and live farther offshore in open waters? a)the transient population is more likely to be affected by contaminants. b)the transient population is less likely to be affected by whale watching vessels. c)the transient population is more likely to be affected by disease. d)the transient population is less likely to be affected by prey availability.

What are some characteristics of a free enterprise economy?

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?