Answer:
The white hair of a polar bear is an example of adaptation.
Explanation:
Adaptation allows organisms to adjust to their surroundings so that they can survive. Polar bears live in the Arctic region, which is one of the coldest places in our planet. They have sharp teeth and their ears are small to reduce the heat loss. They have a thick coat of insulated fur, which insulates their thick layer of body fat and keeps them warm. They have large paws, that are covered by fur which protects them from sinking in the snow and also provides a good grip on ice. Their coat of white fur helps them to hide from their prey by providing a camouflage in Arctic environments. 
 
        
             
        
        
        
<span>Infections
</span><span>viruses
</span>Bacteria
Mold
and so on.
        
             
        
        
        
B. rabbits changing fur color
        
                    
             
        
        
        
Answer:
The structure of mitochondria contains the foldings in the inner side called "cristae" which increase the surface area of the mitochondria. The cristae are important to mitochondria as well as cell as cristae embody the ATP synthase enzymes which help in the formation of the ATP molecules.
Heart cells require more energy to pump the blood from the heart to the body so it needs a more mitochondrial number in the cells with more infoldings to synthesize more ATP.
 
        
             
        
        
        
Answer:
<em>Candida albicans</em>
Explanation:
Yeasts cause candidiasis is a fungal infection.  It is caused by yeast genus <em>Candida</em>. The most common species of yeast which cause candidiasis is the <em>Candida albicans</em>. It habitats in the mouth, throat, gut, and vagina of the human body.  The yeast genera can cause infection if they make entry to the bloodstream when their growth becomes uncontrolled. If also they enter into internal organs such as kidney, heart, brain cause candidiasis.