Aristotle believed that something called the "visual flux" flowed out of eye, bounced off objects, and then returned to the eye, and that this was the basis of eyesight. how did he explain the fact that it gets dark outside at night? a, the sun is not in the s ky. b. the eye puts out less visual flux at night. c. fewer people are active at night so there is less visual flux about. d. night air is opaque because nights are cooler.

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors

Which of the following statements about pesticides and residue is false? a. most conventionally grown produce has detectable levels of pesticides when purchased from the store.b. the us government has determined that small levels of pesticides in produce is safe for humanconsumption.c. organic produce always will be pesticide-free.d. farm workers, children, and pregnant women are at greatest health risk from pesticides. select the best answer from the choices provided.

Which ofbthe following is a characteristic shared by both brazil and mexico