It’s b the pine tree has unprotected seeds, the apple tree has seeds in fruits
        
                    
             
        
        
        
Answer:
a
Explanation:
In the case of the light bulb, electrical energy is being transformed into light and thermal (heat) energy. Different wattages and types of bulbs give off varying amounts of light and heat.
 
        
                    
             
        
        
        
Answer: atp and adp
Explanation: atp is an unstable molecules which hydrolyzes to adp and inorganic phosphate when it is in equilibrium with water.
 
        
             
        
        
        
  Answer:   D. the mucus that helps the sperm travel to the uterus is too thick.
Artificial insemination is the technique in which the sperms are introduced into the female's cervix or uterine cavity. This results in pregnancy through in vivo fertilization. Women cervix is blocked by thick mucus which block the entry of sperms. Therefore, artificial insemination would be better in such situation than other forms of treatment.
  
 
        
                    
             
        
        
        
<span>A) enzymes. Enzymes are what break down proteins. </span>