Answer:
3rd generation = 2 Hybrid DNA molecules + 6 Light DNA
In Percentage 2÷8 × 100 = 25%
25% of the DNA are hybrid
Explanation:
Semi conservative model proposed by Watson and Crick states that one strand of the DNA comes from parent DNA which act as a template for the other newly formed strand.
First generation:
If cells containing 15 N DNA are transferred to a medium with only 14 N then in initial first generation two parent strands becomes separated and act as template for newly synthesized strands. this means that in first generation both DNA molecules are hybrid, one strand of 15 N DNA and other strand of 14 N DNA 
Ist generation = 2 Hybrid DNA molecules
Second generation:
In Second generation these two hybrid molecules become unzip. Two strands are 15N and two strands are 14N. All these 4 strands act as template and 4 new strands are synthesized. The molecules of Hybrid DNA is still 2 with 2 molecules of Light DNA.
2nd generation = 2 Hybrid DNA molecules + 2 Light DNA 
Third generation:
In Third generation these two hybrid molecules and two light DNA molecules become unzip. Two strands are of 15N and six strands are of 14N. All these 8 strands act as template and 8 new strands are synthesized. The molecules of Hybrid DNA is still 2 with 6 molecules of Light DNA.
3rd generation = 2 Hybrid DNA molecules + 6 Light DNA 
In Percentage 2÷8 × 100 = 25%
25% of the DNA are hybrid
 
        
             
        
        
        
Answer:
To be honest, it's optional so hope these answers will work for ya!
Explanation:
*Earth has atmosphere and life while the moon doesn't
*Earth has weather and seasonal changes
*Moon has satellite's that we set up and use
*Types of erosion:
Earth: wind, water, ice, and heat
Moon: impact
*Landscape:
Earth: of course we all know... -._-.
Moon: craters, dust, and rocks
<em>HOPE THIS STILL WORKS! ˋ( ° ▽、° ) </em>
 
        
             
        
        
        
Meiosis because it is the process of gamete formation, which is gametogenesis
        
                    
             
        
        
        
Location 2 is cooler than Location 3 and Location 1 because it's at a higher altitude