The job of the human heart is to circulate blood through all of the body's arteries, capillaries, and veins. the job of the human lungs is to supply the small amount of blood in them with oxygen. the interaction of these two parts of the human body results in a system that a. removes old blood from the body. b. circulates oxygen-filled blood throughout the body. c. turns the protein in blood into food energy for the digestive system. d. breaks down food energy, and turns it into heat.

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

Sex cells from female reproductive organ? 1) mitosis 2) fertilization 3) zygote 4) eggs 5) meiosis 6) sperm

What is the number of moles in 15.0 g ash3?