Cancer is a common disease characterized by uncontrolled a) mitosis b) meiosis

Mitosis is closely controlled by the genes inside every cell. Sometimes this control can go wrong.

If that happens in just a single cell, it can replicate itself to make new cells that are also out of control. These are cancer cells.

They continue to replicate rapidly without the control systems that normal cells have.

Cancer cells will form lumps, or tumours, that damage the surrounding tissues. Sometimes, cancer cells break off from the original tumour and spread in the blood to other parts of the body.

When a tumour spreads to another part of the body it is said to have metastasised.

They continue to replicate and make more tumours. These are called secondary tumours.

So the answer should be A.) mitosis

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.