Organ. An organ is a system of tissues that work together on a larger scale to do certain jobs within an animal's body. Examples of organs are the brain, heart and lungs. Anatomy is an example of a biology specialty concerned with this level.
Drastic change in pH or temperature because the enzyme reaction may become denatured.
Hello, BellaBouye205. Your answer would be Kurt Lewin. In the later years of his life, he devoted his time to studying small social groups. He claimed that groups change people's behaviorally as an individual. He also said that the small groups flourished greatly whenever they were preformed in a democratic way. I hope I helped!! Have a great evening.