Adenine, Cytosine, Guanine, and Thymine.
        
             
        
        
        
the atmospere would drift off into space
none needed
 
        
                    
             
        
        
        
Answer:
Gene. A segment of a DNA molecule (a sequence of bases) that codes for a particular protein and determines the traits (phenotype) of the individual. A gene is the basic unit of heredity in a living organism.
 
        
             
        
        
        
Answer: False
Explanation:
The patellar tendon attaches the bottom of the kneecap (patella) to the top of the shinbone (tibia). It is actually a ligament that connects to two different bones, the patella and the tibia.The patella is attached to the quadriceps muscles by the quadriceps tendon.The medial and lateral vasti muscles also attach independently to patella to form aponeuroses, the medial and lateral patellar ligament. Working together, the quadriceps muscles, quadriceps tendon and patellar tendon straighten the knee. When the patellor tendon is ruptured, the ability to extend the knee is greatly effected and decreased but its not completely disappears. Thus the quadriceps functions is not entirely compromised. 
 
        
             
        
        
        
Plants 
1: The plant cell was the first cell discovered. 
2: Plants cell wall can hold more fluid. 
3: The plant cell is static and protected. 
Animal 
1: The nucleus can be located anywhere in the cell. 
2: Animal cells have small vacuoles 
3: Animal cells can terminate themselves.