It would be the first option. Adenine and thymine.
        
             
        
        
        
Answer:
There are different types of proteins present which are made of amino acid sub-units. Proteins play various important functions in an organism's body. Some of these functions are:
- Growth and maintenance of cells and individuals.
- Antibodies are proteins which provide immunity.
- Enzymes are proteins which catalyze different reactions.
- Many proteins allow movement of substances inside and outside of the cell membrane. They are known as carrier proteins.
- Many proteins serve as structural proteins.
 
        
             
        
        
        
Increased frequency of homozygous genotypes 
        
             
        
        
        
Answer:
Our bodies use water in all the cells, organs, and tissues, to help regulate body temperature and maintain other bodily functions. Because our bodies lose water through breathing, sweating, and digestion, it's crucial to rehydrate and replace water by drinking fluids and eating foods that contain water.
EXPLAINATION:
Hope it helps. Please mark me as the brainliest.
 
        
             
        
        
        
I am certain your answer is true.good luck