A student determined that shaking a container of sand caused the temperature of the sand to rise.
The student then performed a new experiment to
see if shaking a container of pebbles would cause the
temperature of the pebbles to rise.

Identify the dependent (responding) variable in the new
experiment.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.