Which of the following statements is true? organ systems are more complicated than the organs, tissues, and cells that they are made from. two identical daughter cells are created by sexual reproduction. the dna in eukaryotic cells is spread throughout the cytoplasm. the cells of different organisms are very different in structure and chemical composition.

The answer is A: Organ systems are more complicated than the organs, tissues, and cells that they are made from.

Explanation:

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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.