The red shift of some clusters and pairs of galaxies give certain discrete values, or discrete quantum levels. True
False

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy

18. which statement about cancer is true?

Describe the two types of vascular tissue