What would a "good edge" be in bacteria?

Which of these would most likely be a stimulus that would cause the body to initiate feedback mechanisms a.) normal body temperature in an arctic environment b.) normal boy temperature in a tropical environment c.)light physical activity d.)low blood sugar

Your sense of touch depends upon: a. direct contact b. heat chemical c. reactions d. pain

Which planet descriptor does not apply to jupiter saturn uranus and neptune plz hurry