PLS HELP I WILL GIVE BRAINLIESTPLS HELP I WILL GIVE BRAINLIESTPLS HELP I WILL GIVE BRAINLIEST If two or more elements chemically combine what do they make?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )

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.