Answer:
solar radiation is the heat energy received from the sun into the solar system that also reaches the earth.
Polar regions receive the least amount of solar radiation, therefore, they have colder climates.
The equator receives the most amount of solar radiation, therefore, they have warmer to hot climates.
Explanation:
 
        
             
        
        
        
Answer:
B) Nucleotides
Explanation:
The nucleotides sequence of DNA molecules determines the protein that will be produced. The mRNA molecules carry a copy of DNA to ribosome.  the nucleotides consist of three parts-  nitrogenous base, pentose sugar and a phospate group.  There have more than six billion nucleotide pairs in a cell. 
 
        
             
        
        
        
Answer:
during DNA replication
Explanation:
During DNA synthesis, when an incorrect nucleotide gets inserted in daughter strand of DNA, DNA polymerase goes back by one nucleotide pair, excises the mismatched nucleotide and repairs error. Thus, the DNA polymerase checks for mutations at the time of DNA replication
 
        
             
        
        
        
The FDA Food Code recommends cooking chicken to 165°F (74°C). 
        
                    
             
        
        
        
Answer: Muscle cells and neurons spend more energy (ATP) than do fat or skin cells. The more energy a cell needs — greater in neurons and muscle cells, less in more “passive” cells — the more mitochondria tend to be present in the cell.