Oxygen diffuses into the bloodstream from the alveoli because of:
an increased heart rate.
a difference in concentration of oxygen.
an increased breathing rate.
O a difference in concentration of plasma.

In 1996 california legalized the medical use of marijuana, even though it was still illegal under federal law. californians angel raich and diane monson used medical marijuana that they grew on their own property. when federal agents destroyed their plants, monson and raich sued, claiming, among other things, that the commerce clause did not permit the federal government to regulate activities that took place in their back yards and homes. the federal government argued that since consuming locally-grown marijuana for medical purposes affects the interstate market for marijuana, the federal government may regulate—and prohibit—such consumption. whose argument should prevail?

Why do farmer's kill animals in a mean way, don't farmer's have feeling's?

True or false. mucous membranes secrete mucus that traps pathogens.