How do plants obtain carbon atoms?
a. from carbon in the soil
b. from microorganisms that live in soil
c. from carbon dioxide in the atmosphere
d. from animals that feed on the plants

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

Which of the following is not a potential result of deforestation?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.