There were more but they weren't discovered as they were not viral and treatment was unknown and research were not done.
this is called acquired immunity
Answer:
cardiovascular endurance
Explanation: i think cardiovascular endurance is most important because it helps improve many risk factors for heart disease. it lowers blood pressure, maintains weight loss, and makes the heart stronger and more efficient so it can deliver more blood to the muscles.
Answer:
The human brain is the most complex organ in the body.The brain regulates your body's basic functions, enables you to interpret and respond to everything you experience, and shapes your behavior.
Explanation:
Drugs interfere with the way neurons send, receive, and process signals via neurotransmitters. Some drugs, such as marijuana and heroin, can activate neurons because their chemical structure mimics that of a natural neurotransmitter in the body. This allows the drugs to attach onto and activate the neurons. Although these drugs mimic the brain’s own chemicals, they don’t activate neurons in the same way as a natural neurotransmitter, and they lead to abnormal messages being sent through the network.
hope it helps you
Answer:
Primary osteoarthritis is mostly related to aging. With aging, the water content of the cartilage increases and the protein makeup of cartilage degenerates. Repetitive use of the joints over the years causes damage to the cartilage that leads to joint pain and swelling
Explanation:
