Answer:
The answer is C, ligases. 
Explanation:
The ligase chain reaction (LCR) is a method of DNA amplification. The ligase chain reaction (LCR) is an amplification process that differs from PCR in that it involves a thermostable ligase to join two probes or other molecules together which can then be amplified by standard PCR cycling (Barany, 1991).
 
        
                    
             
        
        
        
Answer:
A. Enzymes
Explanation:
Metabolic processes that occur in living cells occur with the aid of certain biological catalysts that acts as regulators. These biological catalysts are called ENZYMES. Enzymes are proteinous molecules that control the rate at which certain biochemical reactions occur in living cells. 
Breaking down of proteins in cells is an example of metabolic, specifically catabolic, reaction. It occurs with the aid of enzymes called PROTEASES that catalyze the reaction. Protease enzyme helps regulate the breakdown of proteins by binding to them. 
 
        
             
        
        
        
Answer:
Spindle fibers are part of a spindle apparatus that moves chromosomes during mitosis and meiosis to ensure even chromosome distribution between daughter cells. The spindle apparatus of a cell is comprised of spindle fibers, motor proteins, chromosomes, and, in some animal cells, microtubule arrays called asters .
 
        
             
        
        
        
Answer:
Plantlife, grow a garden. Animal life, raise some livestock. And a water source, most definitley.
Explanation: