Which of the following statements is true about the atmosphere? a.) the different layers overlap
b.) it extends about 1,000 miles into space
c.) the layers are not affected by the sun’s radiation
d.) all of the above

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems