Interference in light waves:

A. can only be constructive in nature.
B. can only be destructive in nature.
C. doesn't exist; light waves cannot interfere with themselves because there is no medium.
D. can produce bright and dark patterns through a slit.
E. can only occur between different frequencies of light.

D. can produce bright and dark patterns through a slit

Explanation:

Interference in any type of wave can get in two forms, constructive interference, and destructive interference.

The constructive interference is between two waves with the same phase, that is, each crest and trough correspond with the crest and trough of the other, getting as result a wave with twice the amplitude of the original one.

The destructive interference is between two waves out of phase and with the same amplitude. In which the crest of one cancels with the trough of the other.

If light passes through a slit it will get a diffraction pattern in a screen, at which each bright pattern corresponds to a crest, a dark pattern to a trough, as a consequence of constructive interference and destructive interference in different points of its propagation to the screen.  

less than one you can't create energy

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

hope this !