Astructural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of:
a) capillaries
b) villi
c) veins
d) arteries

Describe some of the common health conditions associated with air pollution.

1). explain how health, quality of life, and self-esteem are all

Adog begins walking at a speed of 6 kilometers per hour. after 1 hour, the dog is walking at a speed of 4 kilometers per hour. which is this an example of? a. positive acceleration b. negative acceleration c. speed