Because it’s time consuming and money consuming to observe from space so models are required
Hi there!
Plants are primary producers.
Hope this helps :D
Answer:
The answer is Physical. Physical immunity occurs when a person immune system responds to antigen.
Explanation:
Administer varicella vaccine to the health 6-year old child (who does not have evidence of immunity to varicella) was exposed to a confirmed case of varicella 2 days ago.
Explanation:
It is seen that if a child receives varicella vaccine between 3 to 5 days of exposure, he is safe as disease will not appear in him and would be saved for future infections.
Varicella vaccine is given for prevention against small pox. It is expected once immunised with varicella body will produce antibodies for a span of twenty years or more.
