Suggested but not directly expressed <span />
Answer:
An arrangement is an agreement that you make with someone to do something. ... The caves can be visited only by prior arrangement.
Answer:
C - It has its own structure, grammar, and word order
Explanation: Linguists have postulated that this is because the sentence contains some unpronounced -- but cognitively real -- logical variables like x and y.
A strong requirement is that a testable hypothesis must meet before it can really be considered scientific