In which interaction is the host harmed?

Commensalism
Competition
Mutualism
Parasitism

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Parasitism

Explanation:

in a parasitic relationship, the parasite attaches to the host causing it harm for its own benefit

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.