Why are enzymes necessary? to r3tard the rate of decomposition to act as a catalyst in chemical reactions to conserve the stored energy of a cell

To act as a catalyst in chem reactions

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.