An endogenous nucleoside with a very short half-life (about 10 seconds), with alarming side effects, such as shortness of breath and chest pain, is:

Primary cell lines, such as primary monkey kidney, can be subcultured

A) 10 to 20 times. B) 1 or 2 times. C) 20 to 50 times. D) indefinitely.

Whenever possible, get down to the child's ________ ________ when talking with the child

Fill in the blank(s) with correct word