Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
        
             
        
        
        
We’ve used modern web technologies, including WebGL graphics rendering and some clever code optimization, for blisteringly fast visualization.
Your users will enjoy excellent performance, on any device, where ever they are in the world.
KeyLines performance
        
             
        
        
        
Active transport moves molecules across the plasma membrane of a cell with the help of transport proteins and energy (ATP).
Active transport is the means of transport of molecules across the plasma membrane with the help of energy. This method is usually used for the transport of molecule against their concentration gradient, i.e., from lower concentration to higher concentration. 
Plasma membrane is the outer layer surrounding the cell. It is made up of lipid bilayer, proteins, carbohydrates and cholesterol. The lipid bilayer is amphipathic since the lipid head is hydrophilic and its tail is hydrophobic. The plasma membrane is semi-permeable in nature. 
To know more about active transport, here
brainly.com/question/19098496
#SPJ4
 
        
             
        
        
        
Answer:
The androecium is the sum of all the male reproductive organs, while the gynoecium is the sum of the female reproductive organs. 
and If all four whorls are present, the flower is described as complete. If any of the four parts is missing, the flower is known as incomplete.