The correct answer is B
evidence
persuasive arguments must provide evidence and facts to back up its arguments as people tend to believe in facts delivered with evidence. This can take the form of statistics and other forms of scientific facts back up methods.
Interchangeable parts were identical and could be exchanged for one another in manufacturing of goods
Answer:variable interval
Explanation:
In operant conditioning, a variable-interval schedule is defined as that schedule in which a response is received after unpredicted time , because reinforcement has been administered in diffrent non fixed times. The response is slow and steady. Variable means non fixed time which means reinforcement can occur at any time , using various different time zone. Interval refers to time hence this means reinforcement is administered at various times.
