Question

cell division and cancer
__________ is the disease in which uncontrolled cell division creates a clump of cells known as a
__________.

tumours can be either ________ or ________.

cancer may simply be caused by errors in replicating the cell’s dna. cancer may also be caused by
harmful environmental factors called __________. two examples of carcinogens are:
________ and ________.

Explanation:

1. For the first blank: Cancer is the disease characterized by uncontrolled cell division, and the clump of cells formed is a tumor.
2. For the tumor types: Tumors are classified as benign (non - cancerous, doesn't spread) or malignant (cancerous, can spread to other parts of the body).
3. For the environmental factors: Carcinogens are substances that can cause cancer. Examples include tobacco smoke (contains many carcinogenic chemicals) and ultraviolet (UV) radiation (from the sun, can cause skin cancer).

Answer:

1. The first blank: Cancer; the second blank: tumor.
2. The two blanks for tumor types: benign; malignant.
3. The blank for environmental factors: carcinogens; the two examples blanks: tobacco smoke; ultraviolet (UV) radiation (other valid examples like asbestos, X - rays can also be used).