The power grip is mediated by individual corticomotoneuronal neurons

Progestin-only contraceptives have a failure rate that is:

A. slightly higher than with the use of coitus interruptus B. slightly higher than the combination agents C. slightly lower than the combination agents D. much higher than with the use of condoms

A burn that causes only pain, swelling, and redness is a 

A. first-degree burn. B. second-degree burn. C. third-degree burn. D. partial-thickness burn.