What is the purpose of a scientific model? Select one:
O a. To predict the future.
O b. To explain ideas to others.
O c. To conduct experiments without using real object or
humans.
O d. All of these are correct.

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

What is the inability of an individual or a society to achieve a minimum standard of living known as ?

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.