A scientist believes that a factory has been dumping acid into a local river To test this hypothesis which property of water should the scientist monitor

i think its white blood cells

i hope this

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.