A dog owner wants to test how exercise affects how his dog sleeps. His hypothesis was, “If my dog has more hours of exercise, then the number of hours he sleeps will increase because he uses more energy exercising”. He was careful to give his dog the same amount of food on the days he did the experiment. His results are in the table below. What is the Independent variable?
What is the dependent variable?
What are the constants?
What is the Hypothesis? (If...then and because)

Although there are a limited number of amino acids many different types of proteins exist because..

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases