Answer:
an individual that has one dominant allele and one recessive allele for a trait is heterozygous
 
        
             
        
        
        
The answer is sex cells or gametes
        
                    
             
        
        
        
Answer:
Entropy of an isolated system either increases or remains constant. If there are no irreversibilities in an isolated system then its entropy will remain constant. But that is a hypothetical case. In real life case, there is always some irreversibility present in the system.
Explanation:
 
        
             
        
        
        
Animals that live in any snowbound region may adapt to its environment by growing bigger feet in order to be able to walk over the deep snow. Also the animals might grow thicker fur in order to keep the animal warm while in the cold weather. 
        
                    
             
        
        
        
Answer:
Lactic acid from anaerobic respiriration 
Explanation:
Hope it helps :D