Answer:
your answer will be D. wearing approiate labotary attire 
Explanation:
The student clearly has no gloves on may hurt themselves doing the lab teacher should've had told the kids the rules and what to expect and what to do 
 
        
                    
             
        
        
        
Answer:
true
Explanation:
because it can catch heat waves and other things
 
        
                    
             
        
        
        
Heat water using the sun during the day, and use it during the cold night. 
Use a solar panel to charge batteries during the day, and use the power at night.
        
             
        
        
        
The flu vaccine is essential in our society and should be encouraged and financed whenever necessary. That's because, as we know, the flu is a disease of rapid proliferation and that imposes risks to the lives of some people. The vaccine has the ability to reduce the risk of a person being infected with the flu virus by 50%, this percentage is essential for people who are more sensitive to this virus such as the elderly, pregnant women and people with respiratory problems.
In addition, it is important that the manufacture and distribution of this vaccine is always financed, because the flu virus is a very changeable circle that is constantly changing and needs to be combated annually.