Which of the following choices describes the correct order of events that occur during the cardiac cycle: i. The mitral and tricuspid valves open and the atria force blood into the ventricles. ii. The ventricles contract and push the blood out. iii. The heart relaxes in diastole and the atria fill with blood. iv. The ventricles fill with blood

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

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )

26 a medida que cambia el clima, ¿qué tipo de reproducción más probablemente de a una especie mayores posibilidades de supervivencia?