Which is an example of a physical change? A)
Mixing blue and yellow paint to create green paint
3)
Adding water and yeast to bread dough in order to make it raise
Mixing two liquids together in a test tube and the tube becoming warm
D)
Adding a piece of chalk containing calcium carbonate to a glass of mild
acid causing the formation of a foam of bubbles.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: