Which system is responsible for the exchange of oxygen and carbon dioxide? 1.skeletal 2.circulatory   3.respiration   4.endocrine

If there are 350 trout found in 200 square feet of a pond measuring 1000 square feet what is the estimated trout population of the pond? a. 1350 b. 1550 c. 1750 d. 2000

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?

Select the word from the list that best fits the definition apparent movement of a star used to measure its distance from earth