A clue is defined as a piece of evidence or information used in the detection of a crime or solving of a mystery. A "tipoff," defined as a piece of confidential information, is the best answer choice given. The answer choice "answer" may be tempting, but a clue is not a direct answer but instead a hint or tip about the answer.

Woe means great unhappiness or something or a group of things that cause or causes great unhappiness, so "sorrow" is the correct answer.

An "era" is a specified period of time or an age. Someone might refer to "the era of the dinosaurs" just as he or she could refer to "the age of the dinosaurs." So, "age" is the answer choice closest in meaning to "era" and the correct answer.

The DEGREE to which something occurs is the extent to which it occurs.

A "tradition" is a custom, so "custom" is the correct answer. A "collection" is a group of things; a "voyage" is a trip by sea; the "military" is the armed services; and "astronomy" is the study of space and celestial objects.

"Authority" is a noun meaning "the power or right to give orders, make decisions, and enforce obedience," or a person who has such power. While "rule" might look like the correct answer because someone who has authority can usually make rules, "rule" does not mean the same thing as "authority," so it can't be the correct answer. "Power," however, is the answer choice closest in meaning to "authority," so it is the correct answer.

Since "habitat" is a noun that means "a plant or animal's natural home," we need to pick out another word that means "a plant or animal's natural home." While "sea floor" could be the natural home of certain types of animals and plants, "sea floor" does not mean "a plant or animal's natural home," so it can't be the correct answer. "Natural environment," on the other hand, means "a plant or animal's natural home," so it is the correct answer.

“Symptom” is a noun that means “a physical or mental feature that indicates a disease” or “a sign of the existence of something.” So, we need to pick out an answer choice that means something like “an indication of something.” That means that “treatment” cannot be the correct answer, because “treatment” can mean “medical care given to a patient for an illness or injury,” a meaning which is very far from that of “symptom.” “Sign,” however, is a word that when used as a noun means “ an object, quality, or event whose presence or occurrence indicates the probable presence or occurrence of something else,” and because “sign” is the answer choice closest in meaning to “symptom,” “sign” is the correct answer.

A pause is a break.

"Weight" means heaviness.