<span>If a test tube has been used, and its contents is supposed to be disposed, carefully pour the contents to the lavatory with a confirmation of a professional (as it may damage the pipelines of the sink) and ensure that there are no splashes created that can contact the human skin. Wash the test tube thoroughly and let dry.</span>
        
             
        
        
        
The seven continents and the oceanic plates
        
             
        
        
        
Answer:
The water treatment plant does not work properly.
Explanation:
The data from the river samples showed that there was a problem with the water treatment plant because there is high amount of pollutants are present in the river sample. The presence of pollutants in the samples shows that the water treatment plant did not work properly, if they did no pollutants are present in the river water so this presence of pollutants indicates inefficiency of water treatment plant.
 
        
             
        
        
        
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Answer; 
Doctors recommend that women avoid most medications and alcohol during pregnancy because these substances may cross the placenta and harm the embryo or fetus.
Explanation; 
The doctors recommend that women avoid most medications and alcohol during pregnancy. 
Alcohol during pregnancy can cause fetal alcohol syndrome which is a serious condition that can affect a child throughout life. 
Some drugs, substances or medications may be harmful during pregnancy, depending on the amount and frequency of use.