Answer:
A carrier is an individual who carries and is capable of passing on a genetic. Carriers are associated with diseases inherited as recessive traits. An individual having one normal allele and one mutated allele does not have the disease.
Explanation:
 
        
             
        
        
        
This condensation reaction is similar to that in which a peptide bond is formed between two amino acids (Chapter 3). Thus a single nucleic acid strand is a phosphate-pentose polymer (a polyester) with purine and pyrimidine bases as side groups. The links between the nucleotides are called phosphodiester bonds
        
                    
             
        
        
        
If there was no nuclear membrane then the contest of the cell would spill out. and there will be nothing keeping everything together. 
        
             
        
        
        
Answer:
B. About 90% of the energy is lost as heat escapes into the
surroundings.
C. The snails use about 10% of the plant's energy to carry out life
processes.
Explanation: