The reason why at the equator, there are no summers or winters, only wet and dry seasons is : Because at the equator the daytime, night time, temperature and sunlight are moderate. 
<h3>Meaning of equator</h3>
An equator can be defined as an imaginary line that runs from west to east thereby dividing the earth into two equal part.
The equator divides the earth into the northern and southern hemispheres. because the equator is at the middle every thing that is experienced there is moderate, unlike the those at the polar region.
In conclusion, The reason why at the equator, there are no summers or winters, only wet and dry seasons is Because at the equator is at the middle and therefore the daytime, night time, temperature and sunlight are moderate. 
Learn more about the equator: brainly.com/question/1264608
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The rapid release of air/ gas bubbles during cooling
        
                    
             
        
        
        
This would be the nucleiod region.
        
             
        
        
        
Answer:
Biomass
Explanation:
Biomass is renewable organic material that comes from plants and animals. Biomass was the largest source of total annual U.S. energy consumption until the mid-1800s. Biomass continues to be an important fuel in many countries, especially for cooking and heating in developing countries