2) oxygen constantly diffuses from air or water into a animal's bloodstream. for this to happen, the concentration of oxygen in the blood must be a) greater than the concentration of oxygen in the air or water. b) greater than the concentration of carbon dioxide in the air or water. c) lower than the concentration of oxygen in the air of water. d) lower than the concentration of carbon dioxide in the air or water

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

How does the nervous system affect the excretory system?

Which of the following is a good strategy when it comes to desserts