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endosymbiotic theory (option 3)

Explanation:

hey there,

< Endosymbiotic theory states "the leading evolutionary theory of the origin of eukaryotic cells from prokaryotic organisms", so eukaryotic cells evolved from prokaryotic! >

Hope this helped! Feel free to ask anything else.

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.

scientific consensus is : a general agreement among scientists about a scientific idea.

even though consensus implied general agreement, it doesn't mean unanimity. for example, scientists generally agree that meteor caused dinosaur's extinction. though this may not be proven yet, but it considered a consensus.

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