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 
 
        
                    
             
        
        
        
It’s 5211 bc a is 5, B is 2 and D is 1! hope this helps!
        
             
        
        
        
An ecosystem is a self supporting system in which there is a flow of materials and energy. 
<h3>What is an ecosystem?</h3>
An ecosystem is a self supporting system in which there is a flow of materials and energy. 
Let us now see the role of each organism in the small ecosystem.
- flower - producer
- butterfly - primary consumer
- bird - secondary consumer
- earthworm - decomposer
Learn more about ecosystem: brainly.com/question/13979184
 
        
             
        
        
        
Answer:
the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.
Explanation:
I think it can be incorrect also so refer to Science teacher also. also.