Answer:
Large birds can't fly due to higher weight and weak wings.
Why large birds can't fly?
Large birds like pheasants often walk short distances whereas small birds like chickadees never walk but fly because the large birds have more weight which can't support by the wings to fly in the sky so they walk on the land instead of flying.
While on the other hand, small birds have lower weight and easily fly in the sky so they don't need to walk on the ground so we can conclude that large birds can't fly due to higher weight and weak wings.
Explanation:
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The best strategies to use when taking a test is to read over your notes til memorized. Use any maps that may be helpful. Use a dictionary and highlight any unknown words. 
        
                    
             
        
        
        

How to mark people's Answer as brainliest?

When we ask any questions, that time many of the user's find it easy and answer our questions but only two users can able to answer our questions. So, When two users answers our questions, remember, there will be a Option “Mark as brainliest” down the one answer & another down of one answer. So, The answer which you think is satisfied to you and is good, then mark that answer as brainliest. If only one user has answered your question, Then the option “Mark as brainliest” wouldn't come quickly, after one day or two days, the Option of marking answer as brainliest will come and also you'll get the notification about it. Also, When you make anyone's answer as brainliest, you also gain some points! 
<h3>HOPE IT HELPED YOU TIKKI!! </h3>
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There are different kinds of pathogens. The representation of the symbol that stands for the pathogen are;
- The helper T-cell is represented like a Circle with the Th wrote inside.  
-   The surface protein on the Th cell is the symbol that looks like this ⊥          
or T Th cells.
Pathogens are known to be microorganisms that do invade the bloodstream. It can be easily see among the white cells.
Helper T-cell is known to consist of T-Lymphocytes which monitors the regulation of the immune system. T-cells are regarded as the helper cells that monitors the initial response in front of the pathogen. They includes; TH1, TH2, and TH17. 
Learn more about pathogens from
brainly.com/question/8102979
 
        
             
        
        
        
Answer:
thire is no grup 13 in modern periodic table