Select all that apply: Which of the following are used to describe ecosystem diversity:

A. all extinct organisms

B. all abiotic factors

C. all biotic factors

D. genetic engineering

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?