Part of respiratory system where gas exchange does not occuris called

How does photosynthesis show the conservation of mass and energy?

The many stone tools, fragmentary animal bones, and teeth found at gran dolina, spain, indicate that hominids there? a. processed and consumed animals and other hominids. b. did not differ appreciably from earlier asian homo erectus. c. were similar to later homo sapiens. d. none of the above

Which tool could you see a plant cell? a. a filter b. a microscope c. a microwave d. an electromagnet