Correct answer is (D. Once created in bone marrow, they circulate for our lifetime)
1) if a plant cell then a cell wall
Answer:
<h2>Additionally, environmental pollution is triggered by the introduction of harmful materials, such as gaseous pollutants, toxic metals, and particulate matter (PM) into the atmosphere; sewage, industrial effluents, agricultural runoffs, and electronic wastes into water bodies; and activities such as mining, ...</h2>
A gene contains the genetic instructions for making proteins.