Nebulous means hazy, Tiny means small, Vague means unclear, Insignificant means unimportant, Inadequate means in sufficient. So, Nebulous is nearest in meaning to Vague.
Sort each description by the type of RNA it describes?
a) contains an anticodon b) specifies the amino acid squence for a protein c) contains exons d) has amino acids covalently attached e) is a component of ribosomes f) is the most abundant form of RNA