What can be said about prokaryotes and eukaroytes?

a. eukaryotes always have a cell membrane, but prokaryotes don't.
b. both of these cell types contain a nucleus.
c. both of these cell types contain genetic material.
d. prokaryotes always have a nucleus, but eukaryotes don't.

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.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.