A scientific theory is one that: a. is a law of nature. b. perfectly sums up many years of accumulated experimental results. c. is the foundation of all scientific experiments. d. sounds the most plausible. e. changes each time a different observation is made.

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.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully