Taller trees begin to grow in the last stage
        
                    
             
        
        
        
Monocots<span> have distinct structural features. L<span>eaf veins of the monocots are parallel. Flower parts are in multiples of three per whorl. Stems have no pith region.  Other characteristics of monocots are: its embryo is with a single cotyledon and its pollen is with single pore. </span></span>
 
        
             
        
        
        
Answer:
5.1 billion metric tons of carbon is emitted by U.S as compared to other countries which emits about 32.5 billion metric tons of carbon.
Explanation:
U.S emits about 5.1 billion metric tons of carbon in the atmosphere which contribute in air pollution also helps in rising the temperature of the earth atmosphere because carbondioxide is a green house gas which increases the earth temperature. The main reason of high amount of carbon emission is the high number of industries and more fossil fuels is burnt in the engines of vehicles.
 
        
             
        
        
        
(A) a change in a developmental gene or in its regulation that altered that spatial organization