The earth's atmosphere is divided into five layers. in the middle layer is where most foreign objects, such as meteors, will burn up as they enter the atmosphere. a) exosphere b) mesosphere c) stratosphere d) troposphere

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