Which of the following statements is true about vaccines?
A. Vaccines only work against bacterial disease
B. Vaccines work infecting someone with a dangerous disease
C. Vaccines are yet to be proven safe by scientists.
D. Vaccines work by teaching the bodies immune system to fight off disease
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Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources
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Which of the following statements is true about vaccines?
A. Vaccines only work against bacterial...
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