Answer:
A permanent change in DNA or RNA
Correct answer: Mitochondria
Mitochondria is found in all eukaryotic cells and it perform very important function inside the cell. It is also known as the power house of the cell.
It generate power which is required by the cell for its functioning by converting the energy in to a form that is usable by the cells.
It serves as a site for cellular respiration and ultimately generate energy for the cells from the food we eat to carry out activities and process of the body such as cell division, cell death and growth.
Adhesion is defined as a component of water , an attraction that occurs between two different substances like water and the cell walls of plant cells.
For instance:
A tree requires to be able to transport water from the roots to the leaves atop the tree over a long distance. The Water molecules will stick to the xylem in the method called as adhesion.
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DNA replication needs to occur because existing cells divide to produce new cells. Each cell needs a full instruction manual to operate properly. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions!