Answer - A.)Science
Reasoning - Anything that Study Marine Animals and Mammals for logical research is Science in Generalization.
Answer: diazotrophs
Explanation: The organisms responsible for the fixing of nitrogen are microorganisms called diazotrophs
Spreading out a wave over a larger area just causes the wave strength to weaken, but does not cause gaps to form. Therefore, if you look at photons as waves, spatial gaps never form in light as it travels through free space, no matter how dim it gets.