Cancer is often the result of activation of and the inactivation of genes.
a) oncogenes, tumor-suppressor genes, proto-oncogenes
b) oncogenes, proto-oncogenes, tumor-suppressor genes
c) proto-oncogenes, oncogenes, tumor-suppressor genes
d) proto-suppressor genes, suppressors, oncogenes

Option (C).

Explanation:

Cancer may be defined as the phenomena of the uncontrolled growth of the cell division and the cells require less nutrient medium to grow. Two main types of tumor are benign tumor and malignant tumor.

Proto- oncogenes generally regulates the growth and metabolism. The mutation may leads to the formation of proto-oncogenes to the oncogenes. These oncogenes are responsible for the formation of cancer. The main function of tumor suppressor gene is the suppressor inactivates the tumor genes. There suppression may result in the formation of tumor.

Thus, the correct answer is option (C).

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: