What is the average respiratory rate for a healthy toddler at rest?

Which of the following statements about spontaneous heating is MOST accurate?

A. The process can be accelerated by an external heat source. B. The heat must be able to dissipate as fast as it is generated. C. Air supply around the material must be nearly nonexistent to support combustion. D. It occurs when a material increases in temperature with the addition of external heat.

____________________ refers to increased muscle tone

Fill in the blank(s) with correct word