Which of the following is included in the histopathological test for cancer diagnosis?

What is melanoma?

Malignant tumors are
$I.$ mass of neoplastic cells
$II.$ cells that grow very rapidly and damage the surrounding normal tissue
$III.$ cells that show the property of metastasis
Which of the statements given above are correct?

The genes involved in cancer are known as-

Smoking addiction is harmful because it produces polycyclic aromatic hydrocarbons,which cause:

Physical carcinogens,e.g.,$UV$-rays,$X$-rays,and $\gamma$-rays,cause: