The earth is made up of many interacting system which are quite dynamic in nature. The earth is sub divided into four components which are THE ATMOSPHERE, THE HYDROSPHERE, THE BIOSPHERE AND THE GEOSPHERE. These are the separate systems that made up the earth system.
The hydrosphere is make up of all the water components on the earth surface and how the water cycle through nature. The atmosphere refers to the layers of gases that surround the planet earth while the biosphere refers to the living components on the earth surface. All these systems interact together to keep life existing on earth.
        
             
        
        
        
The maxillary bones and mandible are part of A. the facial bones.
In fact, maxillary and mandible are primary bones of the face which also includes, nasal bones, zygoma, and frontal bone. 
Both are found in the jaw area. The mandible bone is located near the lower jaw, while the maxilla is found near the nasal portion of the face.
        
                    
             
        
        
        
Synthesis of protein is the building up of protein molecule while the breakdown of protein is the degradation of the protein molecule.
<h3>What is protein?</h3>
Protein is one of the biological molecules that present in living organisms and contain it's building blocks known as amino acids.
The synthesis of protein is the process used by living organism to produce proteins from amino acids (that is the building block).
The breakdown of protein is the degradation of protein molecule which is also called catabolism.
Therefore, the difference between protein synthesis and breakdown is that synthesis of protein is the building up of protein molecule while the breakdown of protein is the degradation of the protein molecule.
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Gametes have a single copy of an allele for each gene while zygotes have two copies for each gene.