Answer:
Micronutrients helps in preventing the skin from different types of allergens or pollen which may result in skin rashes or hives. It protects skin againts various pathogens or fungi. It acts as anti oxidants on skin and thus prevents premature ageing. It also protects from harmful UV radiateion which damages DNA.
Explanation:
A mutualistic and A a decrease in the number of corals
A.photosynthesis because algae is a type of plant.
Since it is outside your body, the answer is B, external stimulus