Why does the coughing up of worms play an important part in the life cycle of some helminths, such as the roundworm ascaris lumbricoides?

The friction red blood cells encounter when moving past each other. cardiac output: the amount of friction blood encounters during flow through blood vessels. blood pressure: the force of the blood against the vessel wall. blood viscosity: the volume of blood pumped out by one ventricle each minute.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?