Answer;
To give them an increase in surface area to perform cell respiration and photosynthesis. Both organelles are semiautonomous organelles that grow and reproduce within the cell.
Explanation;
-Mitochondria are known as the powerhouses of the cell. It creates energy rich molecules for the cell.The biochemical processes of the cell are known as cellular respiration. Mitochondria are made of two membranes.
-The outer membrane covers the organelle and contains it like a skin. The inner membrane folds over many times and creates layered structures called cristae. The fluid contained in the mitochondria is called the matrix. The folding of the inner membrane increases the surface area inside the organelle.Since many of the chemical reactions happen on the inner membrane, the increased surface area creates more space for reactions to occur.