The human heart has only 4 chambers. Left and right atria and left and right ventricles.
        
                    
             
        
        
        
The answer is A. Uses too much energy.
        
             
        
        
        
Answer:
The cel theory is important because it affects nearly every aspect of biology, from our understanding of life, death, to how we manage diseases and more.
Explanation:
I majored in Biology
 
        
             
        
        
        
Answer:
Ethnicity
Explanation:
<em>The correct answer would be </em><em>ethnicity</em><em>.</em>
<u>By definition, ethnicity refers to the variety of physical and behavioral characteristics that distinguishes one group of people from another group of people. </u>
Individuals or a group of people that shares the same culture and a sense of identity would belong to the same ethnic group while those with dissimilar culture and physical identity would be in different ethnic group.
 
        
             
        
        
        
Answer:
climate is weather and it affects ecosystem development