Answer:
Because developed countries usually rich, high levels of production require efficient production in factories
Explanation:
The top number is the maximum pressure your heart exerts while beating (systolic pressure) the bottom number is the amount of pressure in your arteries between beat (diastolic pressure)
The most common source of water contamination is: A. sewage.
Answer:
The correct answer is 2. Usually multiple mutations are required in different genes to cause cancer.
Explanation:
Mutation is the change in the DNA sequence of a cell which plays an important role in causing cancer. Mutation in many different genes allows the cell to grow and multiply in an uncontrollable manner. It also allows the cell to gain the property of metastasis.
Metastasis is the property of malignant tumor cell which allow the mutated cells to invade different tissues and organs and multiply in numbers. This property plays an important role in causing cancer. Therefore several mutations in different genes are required to cause cancer. So the correct answer is 2.
