Which of the following statements are true about measurements and units? a. the si unit is used by scientists all over the world. b. the unit of mass in the si system is the kilogram. c. measurements do not need to include units. d. the english system of measurements is based off of the powers of ten.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

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

What is the primary function of the nervous system?