60 percent of the biodiversity is in coral reefs
        
             
        
        
        
Answer:
Human heart is myogenic becoz it have the tendency to generate impulse by itself. The upper right auricle wall of heart has sino atrium node or SN node which helps in generation of impulse without any external stimulus. 
 
        
             
        
        
        
Answer:
A
Explanation:
This is because all the macromolecule shown is contain in carbohydrates
 
        
             
        
        
        
As a result of decreasing Arctic sea ice, animals that rely on the sea level for survival may become extinct as their habitat disappears.
The increase in the atmospheric greenhouse gases means that more radiant energy from the sun that could have escaped back into space is being absorbed, leading to an increase in the global temperature. 
The increase in the global temperature means that more Arctic sea ice would be melting and decreasing in size. As the ice melts, the water moves into seas thereby causing a rise in their levels.
A rise in sea level means the disappearance of coastal habitats. Thus, a loss in biodiversity will occur as the habitats of plants and animals disappear as a result of the rise in sea levels. 
More on climate change can be found here: brainly.com/question/24544474
 
        
                    
             
        
        
        
The two organs that is responsible for ion exchange in bony fishes are gills and kidneys. They maintain the ion balance in the body of bony fishes.
The kidneys in the fishes are comparatively very small and they excrete a very small amount of urine to balance the ion in the body of the fishes.
The gills maintains the constant flow of water in the body of the fishes to compensate the ions in the body of the fishes in water, called as osmoregulation.