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Cytology is the study of the chemistry, structure, and function of a cell. Cytology is the study of cell structure, composition, & interaction with other cells. Cytology is the medical and scientific study of cells. Cytology is the branch of biology concerned with the structure and function of plant and animal cells.
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I believe it is 4)Shearing teeth (Carnassial teeth)
 Amniotic egg are for reptiles
Fur are for marsupials, and dogs 
Retractable claws are are cats 
Shearing teeth are for carnivores
 
 
        
                    
             
        
        
        
Answer:
The answer to this is Genetic Engineering
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Stable isotopes refers to those isotopes that do not undergo radioactive decay. Oxygen atoms with atomic number of 16 and 18 are examples of stable isotopes. These isotopes of oxygen are usually found in substances such as polar ice and calcite. These substances are usaually measure with isotope fractionation and the ratios obtained are used to estimate water temperature of ancient oceans. From this, scientists can find out facts about ancient climates,