How are vaccines “victims of their own success”?

Minute vessels that collect blood from the capillaries and join to form veins are: venoles venules viscera venoids

Arm circles are often effective dynamic stretches for swimmers because they

Frankie is having difficulty developing a friendship with histeammate curtis. whenever frankie invites curtis to hangout with him at the park, curtis always says that he's busy.what is most likely preventing a healthy relationship fromforming? a)the boys are not being generous with their time andeffort.b)the boys are not communicating.c)both boys are too busy.d)the boys are on different teams.