<span>The macrophage is the cell responsible for detecting, engulfing and destroying pathogens and apoptotic cells. These cells process and present antigens (foreign materials) to immunocompetent cells and thus they are the key mediators in the development of all immune reactions.</span>
I think the answer is Traction
m - Meter - Length.
s - Second - Time.
A - Ampere - Electric Current.
K - Kelvin - Temperature.
kg - Kilogram - Mass.
Answer:
Algae produced and still produces much of the world's oxygen supply, especially in the atmosphere.
Please give brainliest.
Explanation: