16. Which of these statements describes what happens during radioacove decay? A A stable isotope Interacts with an unstable Isotope.
B. A stable sotope breaks down and becomes unstable.
C. An unstable isotope breaks down into a more stable, sotope.
An unstable sotope interacts with another unstable sotope.

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.

the correct answer is anaphylaxis.

anaphylaxis is a condition caused by insect bites, foods, medications, manifested by tongue swelling, shortness of breath, vomiting, low blood pressure. it sometimes may occur without an obvious reason. it is treated with epinephrine injection.other tretments include antihistamines and steroids,

the correct answer is: " ventricles " .

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