Amanda is 13 years old. What is her estimated maximum heart rate? a
178 bpm

b
196 bpm

c
207 bpm

d
220 bpm

Astructural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: a) smooth muscle b) skeletal muscle c) respiratory cilia d) rings of cartilage

Ingredients used in tobacco products been banned?

Astairway has 6 steps. is it a handrail required? a. a handrail is required b. a handrail is not required c. double handrails are required d. only nosing is required