Nicotine is a highly addictive substance that is found in tobacco. Chemicals in tobacco are inhaled into the respiratory system when you smoke. This can cause many problems such as lung and throat cancer. Thousands of deaths are recorded in the U.S. related to smoking tobacco.
Answer:
risk factors are:
1. Having unprotected sex. ...
2. Having sexual contact with multiple partners. ...
3. Having a history of STIs . ...
4. Being forced to engage in sexual activity. ...
5. Misuse of alcohol or use of recreational drugs. ...
6. Injecting drugs. ...
7. Being young.
An experiment should have only one independent variable.
Answer:
The heart is made of Muscle tissues
Explanation:
This is to help the heart walls compress and relax in order to pump blood
