It’s either A or B
Diseases can often cause a decrease in the population 
But also without healthy grass for them to eat, they begins to die off cause of not a lot of food left for them to eat enough to survive.
 
        
                    
             
        
        
        
<span>Tertiary</span> structure - three-dimentional structure of one polypetide chain.
Proteins are considered as for their conformation in four different stages:
Primary structure is referred solely to the sequence of amino acids<span> in the polypeptide chain.
</span>Secondary structure is the immediate basic folding of a protein and it can be α-helix and β-sheets.
Tertiary structure is the three-dimentional folding of a singles polypetide.
Quaternary structure is the thee-dimenional structure that results from the combination of two or more individual polypetides working as single protein.
        
             
        
        
        
1. rain-forest
2.10000
and yes u were right!!!;)