The muscles moved quickly to defend themselves against this new predator by thickening their shells
Answer:
PVR is calculated by the formulae: 
Explanation:
Pulmonary vascular resistance may be defined as the resistance to blood through the pulmonary circulation.
PVR can be determined by the following formula:
Here, PAP is the pulmonary artery pressure, PAOP is pulmonary artery occlusion pressure and CO is cardiac output.
The answer is N<span>osocomial. It is the t</span>ransmission of disease that occurs when disinfection procedures fail to prevent contraction of disease from the medical facility. <span>A hospital-acquired infection (HAI), also known as a </span>nosocomial<span> infection, is an infection that is acquired in a hospital or other health care facility. </span>
These are symptoms of HEAT EXHAUSTION. Heat exhaustion usually occur as a result of over heating of the body. Symptoms may also include heavy sweating,slight fever, excessive thirst, fainting,nausea, rapid pulse.etc.
Heat exhaustion can be prevented by protecting oneself from excessive heat.
