Respiration occurs in

Which of the following correctly list the first appearance of organism in the fossil record from earliest to most recent

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Climate warming trends allow plant and insect species to inhabit larger ranges. select the best answer from the choices provided