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<span>The first great discovery of genetics happened In 1865, when Gregor Mendel published a paper on his study of inherited traits in plants. He is often called the founder of genetics.
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The circulatory system<span> comprises the </span>heart<span>, veins, capillaries and arteries. ... Once depleted of oxygen, the blood returns to the lungs and </span>heart<span>. To </span>maintain homeostasis<span>, the </span>circulatory system<span> delivers oxygen and nutrients in the blood so that they can pass into fluids surrounding the cells.</span>
