Answer:
I think the answer is C
''Reusing plastic bags''
Explanation:
Removing carnivores from a forest  has a great impact on a environment since the population of the herbivores will increases drastically and the dynamic equilibrium of the area will be greatly effected.
If we look at choice B '' Heating homes with fossil fuels'', this will also have a big impact on the earth since fossil fuels are non-renewable and take centuries to form. Heating homes with them will result in loss of fossil fuels. 
Now let's look at choice D ''Adding heavy metals to the water supply''. Heavy metals are dangerous to the human health and even cause cancer. This will cause thousands of deaths and will also have a great impact on the global stability.
This leaves choice C ''Reusing plastic bags''. This will cause less pollution and less harm to wildlife but doesn't have any big threat to the global stability. As in changing the world population or causing deaths in large numbers.
so I think choice C is the answer
 
        
             
        
        
        
Answer:
The drops of water in the clouds are heavy enough to fall. 
Explanation:
Precipitation forms in the clouds when water vapor condenses into droplets of water. When the droplets are heavy, they fall to the Earth. These droplets can fall in the form of rain, hail, or snow. 
 
        
             
        
        
        
The awsner is cones....your welcome
        
                    
             
        
        
        
Based on this data, you may safely conclude that THE SUPPLEMENT MAY CONTAIN CARBOHYDRATES AND LIPIDS AND ONE OTHER FOOD GROUP BASED ON THE ELEMENT THAT IS PRESENT.
Carbohydrates and lipids are food macro molecules whose building elements are carbon, hydrogen and oxygen. Thus, the presence of these elements in the food supplement means that the food macro molecules are probably present.<span />
        
             
        
        
        
Answer: carbonate rocks are weathered, forest fires occur, and volcanoes erupt.
Explanation: