D most likely because we can then learn if the animal gets affected by the amount of whatever you use or not.
Answer:
"For me, a school uniform levels the playing field," explained Hank. "In what ways?" asked Maddie. "No one gets hung up on fashion," Hank continued, "and we can just be who we are. Nobody tries to impress anyone. "That's silly!" exclaimed Maddie. "Clothes dont make us who we are, Hank. That is simply not true." "Well," said Hank "they let us know whether or not our parents allow us to spend a ton of money on fashion or"- "Maybe" Maddie interrupted, "but I still think you're wrong. It doesn't take a lot of money to dress in your own style." "Cant you show your own style in what you wear after school or on the weekends?" asked Hank, shrugging his shoulders. Maddie snapped "That's not the point, don't i have a right to choose my own clothes?" "I don't know about that," Hank replied with a sigh, lets continue this debate over lunch, Maddie.
Explanation:
It’s long please make it shorter.
