PLEASE I NEED AWSNCER FAST!! Drag the tiles to the boxes to form correct pairs.
Use the Hertzsprung-Russell diagram to determine which condition describes each star. Use the arrows to help you locate the stars.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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 2 options: 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 cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap