White blood cells produce antibodies to destroy......
The disease causing microorganisms have protein markers called antigens on their surface
The correct answer is the root Cap
Answer: An emission nebula is a cloud of ionized gas. The most common source for ionizations are high energy photons emitted from a nearby star. These can be among some of the most colorful objects in the sky. Reflection Nebulae are clouds of dust which are simply reflecting the light of a nearby star or stars.
Explanation:
The answer is D
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