Answer:
a bear was attacking her in the nightmare
The answer is the first one, you must always cite your sources, even if you have not directly quoted them. It also adds credibility to your work (this is not the only reason, it is merely an incentive)
Answer:
They both Use some sort of energy. the sun uses Radiant/light energy
In this sentence the comma is being used as an appositive. This is because the phrase "an old junk heap" renames or redefines what the "car" is.
