Which portion of visible light has the lowest energy? The highest? Why is this important to photosynthesis?

What is the inability of an individual or a society to achieve a minimum standard of living known as ?

The bacteria inside a tube worm would be analogous to what organism in the ocean ecosystem near the waters surface? a. photosynthetic algae b. shrimp c. clown fish d. parasitic lamprey

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