Im not positive but I think it's b or c
        
                    
             
        
        
        
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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Or <span>The average density of the boat, including the steel and air, is less dense than 1.00 g/cm³..</span>
        
                    
             
        
        
        
Hypophyseal portal system  is a blood system of vessels in the microcirculation at the base of the brain, connecting the hypothalamus with the anterior pituitary. It is involved in quick transportation and exchange of hormones between the hypothalamus arcuate nucleus and the anterior pituitary gland. Hypothalamic-hypophyseal tract comprises of neurons that deliver vesicles with neurohormones from the hypothalamus to the posterior lobe of the pituitary gland. In this case, it is partly contained within the infundibulum (hollow stalk connecting the hypothalamus and the posterior pituitary gland).
        
             
        
        
        
Growth is defined as the irreversible increase in the dry mass of an organism. It is brought about by an increase in cell size or number. In plants, growth occurs throughout the lifetime of the plant. ... Plants have extensive powers of regeneration. They can replace lost or damaged tissue.