I'm not sure but I'd say mice? They're small but have lots of stuff in them, and birds have hollow bones so there's that. I'm not 100% though
        
             
        
        
        
Answer C. Cells have spcialized structure that perform different functions.
        
             
        
        
        
We lost dinosaurs due to the impact of a massive comet or asteroid that was 10-15 kilometers wide, as proposed in 1980. 
 
        
                    
             
        
        
        
Answer:
c. The antibiotic-resistant bacteria are the result of bacteria that specifically modify their own chromosomal DNA to neutralize the antibiotics
Explanation:
In antibiotic resistant M. tuberculosis bacteria, the M. tuberculosis bacteria become drug resistant due to modification of its chromosomal DNA to the antibiotic due to selective pressure.
Note that selective pressure is an reason for any organism with certain phenotypes to have a survival benefit or disadvantage. This thus leads to natural selection. 
This natural selection is what causes the M. tuberculosis bacteria to survive.