An ecological niche is an organism's specific habitat in an ecosystem.
It is where it lives and feeds, etc.
        
                    
             
        
        
        
Answer:
They have a closed circulatory system.
Explanation:
In an open circulatory system, blood vessels transport all fluids into a cavity. When the animal moves, the blood inside the cavity moves freely around the body in all directions. 
Closed circulatory systems are different to open circulatory systems because blood never leaves the blood vessels. Instead, it is transferred from one blood vessel to another continuously without entering a cavity. 
 
        
             
        
        
        
Answer:
the right answer is
tRNA bonds with mRNA, bringing in amino acids.
Explanation:
 
        
             
        
        
        
Body's major metabolic hormone is called Thyroid hormone
        
             
        
        
        
Answer:
3. The equator receives more direct sunlight than the North Pole.
Explanation:
<h2>The equator is the longest latitude at 0°.</h2><h2>The equator isn't influenced any change when the earth revolves around the sun cause winter and summer. </h2><h2>That's why equator is warmer than north and south pole.</h2>
<h2>I hope you understood</h2>