When children are young and go to the doctor, the doctor will give them booster shots. this re-exposes the children to a dead portion of a disease to them build immunity.

which type of immunity is described?

a. active
b. passive
c. antibiotic
d. phagocytic

A - active. The immunity that develops after exposure to foreign substances such as infection or vaccinations.

A. Active

Explanation:

Active immunity is the kind that a body develops after being exposed to a microorganism or substance that may cause a disease. That's what happens during vaccination. The disease won't happen because the organism is dead, but the body senses it as a threat and builds up the immunity for it.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

where are the choices