Yes they are different,
A food web can show many different consumers and producers in an ecosystem while in the other hand a food web just show the relationship between one group of producers and consumers.
        
             
        
        
        
The answer is A as Adenine (A) pairs with Thymine (T) and Guanine (G) pairs with Cytosine (C)
        
                    
             
        
        
        
Answer; 
True.
Tobacco can damage the immune system of a person with aids.
Explanation;
-Smoking of tobacco is dangerous and cause various effects to the body. These effects include; causing serious health conditions like cancer,and also lessening the body’s immune response, making it more susceptible to infections. 
-Tobacco products damage virtually every system of the body, and the immune system is no different.
 
        
                    
             
        
        
        
Answer: diploid generation
Explanation: MORPHOLOGY AND DEVELOPMENT OF THE MOSSES
In vascular plants the dominant stage of this lifecycle is the diploid generation. In mosses, the dominant stage is the haploid generation (the gametophyte). This means that the green, leafy gametophytic tissue is haploid (has only one set of chromosomes). hope this helps. Can u give me brainliest
 
        
             
        
        
        
Answer: I'd say C 
Explanation: Small plants are at the bottom of the ecosystem, which means they have to start it out. I'm not sure tho.