3. (3 points) label each example as either (pi) passive or (ai) active immunity:
a. bill had chicken pox when he was five. he doesn’t catch it again, even when his nephew gets sick with the virus
b. billy jr gets vaccinated with a live attenuated form of the chicken pox virus. he doesn’t get chicken pox after playing with his infected cousin.
c. bill’s 3 month old daughter is breast feeding. she does not get chicken pox after playing with her infected cousin.

How many cells are our body made of ? ♡

Which excerpt from the land, part 4 best supports the claim that paul is a talented horseback rider? a/“figure that says more than anything else! now, i want to ride that stallion! " b/my daddy shook his head. "paul only rides horses he knows. ” c/? i glanced over at the other rider. the fellow was older than i, and had the weight of a man on him. d/a man out of alabama, man name of ray sutcliffe, told my daddy i was such a good rider, he wanted me to ride some races for him.

What percentage of light hits earth's surface directly?