Answer:
see below hope this helps !
Explanation:
Asexual reproduction involves one parent and produces offspring that are genetically identical to each other and to the parent. 
Sexual reproduction involves two parents and produces offspring that are genetically unique.
 
        
                    
             
        
        
        
The correct answer of the given question above would be the third option: THE EVOLUTION OF POPULATIONS OVER TIME. What is represented by the base of a phylogenic tree is the evolution of populations over time. It is also known as the evolutionary tree. This tree shows the evolutionary relationships among species. 
        
                    
             
        
        
        
Pressure would be my best guess, since no choices were given.
        
             
        
        
        
A carbon atom has four electrons in it’s balance shell. as the maximum number of electrons that can be within the second shell of electrons is eight, it is able to bond with four other atoms in order to have a full shell of electrons.
hope this helps :) (please mark brainliest if right!)