Answer:
Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. This is usually due to the long time it takes for them to be replenished. Renewable resources are replenished naturally and over relatively short periods of time.
Explanation:
 
        
             
        
        
        
Answer:
A. Because energy is lost at every level.
Explanation:
energy decreases as it travels from lower levels to upper levels--which is a logical observation you could make. 
Think of it like this--if a fish eats a small organism, it will then spend some of the energy obtained from the organism swimming around--so when a larger fish eats our fish, the energy from the original organism will already be partially lost (from our fish swimming around). 
This means that when this pattern continues over multiple levels, we keep losing energy--which limits the environment's capacity for organisms to survive. 
Hope this helps, have a lovely day :)
 
        
             
        
        
        
Pretty sure it’s convection
        
             
        
        
        
The clear and colourless fluid that surrounds cells and protein fibres in connective tissues is called Ground substance
        
             
        
        
        
Precipitation or the water cycle