Answer:
Vaccines prevent the spread of contagious, dangerous, and deadly diseases. These include measles, polio, mumps, chicken pox, whooping cough, diphtheria, and HPV. The first vaccine discovered was the smallpox vaccine. Smallpox was a deadly illness.
A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and effective way. A vaccine activates our immune system without making us sick.
Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself.
Explanation:
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<u>Why were the doves upset?</u>
The doves were upset because the snake had eaten their eggs and chicks.
Answer:
He came to my house <u>in</u> my absence.
Explanation:
The word that is missing in the given sentence is the preposition <em>in</em>. Prepositions are words used to link nouns, pronouns, or phrases to other words within a sentence and express the relationship between them.
The phrase <em>in the absence of (someone or something) / in (someone's or something's) absence</em> means <em>while someone/something is away</em>. The word <em>in </em>will always be used in this case.
