Answer: Pulmonary aortic valve
Explanation:
It is observed that the human population keep increasing significantly and it began to increase noticeably around 10,000 years ago.The greatest factor of this increase is the rapid development of the agricultures in lands, as well as the domestication of animals. These are the reasons why population increases at that time.
Answer:
Kidney
Explanation:
The kidney is the body system that regulates the acid base balance of the blood.
Answer:
Explanation:
What are the three main building blocks of the body?
Nutrition Proteins: building blocks of the body. Excluding water and fat, the human body is made up almost entirely of protein. Protein is the main component of muscles, bones, organs, skin, and nails.
Plants use nitrogen for <u><em>making protein</em></u> since proteins are rich in it because of the amino group of the amino acids.
