Answer:
definitely the heart
Explanation:
when you see "pumps blood throughout the body" you can think of the heart!
Answer:
If something happens to one friend you have another one that can help you. The more people you're with, the safrer you are.
Explanation:
Answer:
Cross- sectional
Explanation:
A cross-sectional study can be explained as a type of observational research that analyzes data of variables collected at one given point in time across a sample population or a pre-defined subset.
It involves the use of different groups of people who differ in the variable of interest but share other characteristics, such as socioeconomic status and educational background.
In conclusion, it should be understood that, Cross-sectional studies are usually relatively inexpensive and allow researchers to collect a great deal of information quite quickly, but still show individual character.
Answer:
Your kidneys remove wastes and extra fluid from your body. Your kidneys also remove acid that is produced by the cells of your body and maintain a healthy balance of water, salts, and minerals—such as sodium, calcium, phosphorus, and potassium—in your blood.
Explanation:
The immune system is the body's first line of defense against pathogens.