Which of the following best explain why earthquakes occur? O The movement of people, animals, automobiles, and trains causes earthquakes.
O The movement of the tectonic plates can cause energy to be stored in rocks. A
sudden release of this stored energy causes earthquakes.
O The force of the Earth orbiting the Sun causes earthquakes.
O All earthquakes are caused by giant asteroids crashing into Earth.

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed