Algae and nitrogen-fixing bacteria are photosynthetic organisms.
        
             
        
        
        
The circulatory system takes the carbon dioxide from the cells to the lungs and the respiratory system expels ir. 
        
                    
             
        
        
        
Coniferous trees dominate Boreal forests rather than tundra because of the lack of permanently frozen soil.
a lack of permanently frozen soil.
<u>Explanation:</u>
Boreal forests are characterized by a cold but not so cold weather. This means that it is too cold for the growth of deciduous trees. When it comes to the growth of tundra, the weather isn’t cold enough for the growth of tundra.
Tundra requires permafrost which is a permanently frozen layer of ground . The Boreal forests lack permafrost and thus isn’t suitable for the growth of tundra vegetation.
 
        
             
        
        
        
The translation is initiated as the
small ribosomal subunit muddles to the mRNA. Then
the tRNA having the methionine binds to the start codon, and the large ribosomal subunit binds to the insignificant one.
Finally, t<span>he start codon indicates the start of
translation.</span>
 
        
             
        
        
        
DNA is made of a double helix of two complementary strands. When replicating, these strands seperate. Each strand of the original DNA then acts as a template for the production of it's counterpart, which is referred to as semiconservative replication.