HIV or Human Immunodeficiency Virus kills or damages the body's Immune system cells. The correct answer is option B. HIV specifically damages or kills the T-Helper Lymphocytes or T-cells, which are very important to the body's immune system. These cells are the cells that respond rapidly to infections.
Without the green house effect, earth would be like a solid ball of ice and rock. Life as we know it wouldn't exist without greenhouse gases. The temperature would drop below 0° Fahrenheit!
