there is no need to find a mate
 
        
             
        
        
        
Answer:
Option-D, a segment of DNA
Explanation:
A gene represents the particular segment of DNA which contains the instruction for the trait of an organism. The nucleotide sequence present in the segment provides the instruction in the form of codons.
The gene is present in the form of its alternative form called alleles which are located on the chromosomes at locus. The alleles represent the variants of the gene and therefore controls the two variety of a single trait.
Thus, Option-D is correct.
 
        
             
        
        
        
The answer is B, decomposers.
        
                    
             
        
        
        
Usually you can change that if you go to bed at like maybe say 7:30pm or maybe even 8, sometimes if you do that then you won't be tired in the morning. Hope this helped, have a great day! :D
        
             
        
        
        
Answer:
Microbiology - Study of very  tiny living thing.
Zoology - Study of  animals.
Ecology -  Study of living things and environment.
Botany - Study of plants. 
Explanation:
The branch of science which deals with the study of very tiny  living thing i.e. microorganism is called Microbiology.
The branch of science which deals with the study of animals is called Zoology.
The branch of science which deals with the study of living things and environment is called Ecology.
The branch of science which deals with the study of plants is called Botany.