8. in which layer of earth are the convection currents that directly result in tettonic plate motion found?
a. crust
b. inner core
c. mantle
d. outer core

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.