How does groundwater become polluted? a. Pollutants mixed with water pass through permeable layers above the aquifer. b. Factories dump their waste directly into aquifers. c. Refuse infiltrates the water table when garbage is dumped. d. All of the above

How do cells grow and reproduce to maintain homeostasis?

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle

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.