Answer:
scientists can also analyze DNA to discover how closely organisms are related. Every living creature has DNA, which has a lot of inherited information about how the body builds itself. Scientists can compare the DNA of two organisms; the more similar the DNA, the more closely related the organisms.
Light is to sun bc the sun gives us light.
If a substance is not able to be separated by physical means but is able to be separated by chemical means, it is a compound.
It's letter C :) I think..