If many observations or results of experiments fail to agree with your deductive reasoning, then: the general principle or theory is probable true.
the general principle or theory is probably false.

not only is it colder, it also becomes darker, less salty, and more dense.

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.