The Patient Protection and Affordable Care Act<span>, often shortened to the </span>Affordable Care Act<span> (</span>ACA<span>) or nicknamed Obamacare, is a </span>United States<span> federal statute </span>enacted<span> by the 111th </span>United States<span> Congress and signed into law by President Barack Obama on March 23, 2010. The term "Obamacare" was first used by opponents </span>
T cells attack antigens on foreign substances and B cells produce antibodies.
The discovery <span>May, 1911: Rutherford and the Discovery of the Atomic Nucleus. In 1909, </span>Ernest Rutherford's<span> student reported some unexpected results from an experiment Rutherford had assigned him. Rutherford called this news the most incredible event of his life.</span>
Cardiorespiratory endurance is the ability of the heart, blood, blood vessels and lungs to supply enough oxygen and necessary fuel to the muscles during long periods of physical activity.