People who smoke cocaine are at risk for increased breathing problems like bronchitis and pneumonia due to irritation and inflammation of the tissues in your breathing tract.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms