A toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
Answer:
0.5 or 50% = 2/4 First box on the bottom
Answer:
Step 2: The right ventricle pumps the oxygen poor blood to the lungs via pulmonary valve. Step 3: The left atrium receives oxygen -rich blood and pumps it to the left ventricle. Step 4: The left ventricle pumps the oxygen-rich blood via aortic valve, submitting this blood through the entire body.
Explanation:
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