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<h3>1. Hepatitis B </h3><h3>2. Levels of circulating antibodies against a certain antigen.</h3>
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C. alive. The vaccine contains a live strain of varicella-zoster (chicken pox) virus which has been attenuated so that it will stimulates the immune system but does not cause any disease in healthy people.
A)amino acid is the correct answer
Homeostasis<span> can be defined as a property of an organism or system </span>
Air pressure is the amount of pressure exerted by the air in a particular air mass. Humidity is a measure of the water content of the air mass. Clouds are tiny drops of water or ice that form in the atmosphere. Wind is a process of movement of air that occurs due to the uneven heating of the Earth's surface.