Which of the following types of cells suppress immune responses?a. Neutrophilsb. Plasma Cellsc. Macrophagesd. Regulatory T Cells

The correct answer is d.

Explanation:

Regulatory T-cells are a class of T cells which are part of the immune system that suppresses immune response. They are called regulatory because they assist in "checking" the excesses/overreaction during immune response.

NOTE:

Neutrophils are phagocytic in nature; they ingest and destroy microorganisms or other foreign molecules.

Plasma cells synthesize antibodies which are produced in response to antigens. They are target foreign particles for digestion by other immune cells.

Macrophages are also phagocytic in nature usually found at sites of an infection.

It is the layer where we observe lightning. It extends down to sea level. It is the place where meteors burn out. It is the last layer of the atmosphere before space.

The mesosphere is a layer of Earth's atmosphere. The mesosphere is directly above the stratosphere and below the thermosphere. It extends from about 50 to 85 km (31 to 53 miles) above our planet.