For more population and it is also bad if the world is overpopulated.
        
             
        
        
        
I believe temperature is the answer
        
             
        
        
        
The difference is because there about different from one another, the reflexes will act different towards the speed
        
             
        
        
        
The correct answer is option C, that is, the presence of the nuclear membrane.  
Cyanobacteria is a phylum of bacteria that attain their energy via the process of photosynthesis, and are the only photosynthetic prokaryotes possessing the tendency to generate oxygen. As a prokaryote, they are devoid of the nuclear membrane.  
Euglena refers to a single cell flagellate eukaryote. It comes under the class Euglenoidea. The species of Euglena are witnessed in salt water and in freshwater. Being a eukaryote, they possess nuclear membrane.