You are presented with the question "Cells secrete acids and bases to maintain what?" and the following answer choices: 
- Chemical energy
 - resistance
 - increases a body's strength
 - To keep their body heat.
 - most human enzymes
 - aerobic capacity
 - allow growth
 - temperature

Now knowing that cells secrete acids and bases to maintain the proper pH for enzymes to work and most human enzymes work at a optimal pH of 7.4, but other enzymes work at many different pH ranges, choose the best answer.


 

     most human enzymes    