1. Do tests involve active or passive immunity? Explain. 2.In both cases, what happened to the person’s antibody level after the vaccine was first injected?
3.Which person had most likely already been exposed to the pathogen? Explain.
4.Which version of the vaccine seemed to be more effective? Explain.

the role of the microscope world in creating new materials .

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

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