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Prompts Submitted Answers The larvae of a lake fly living in Lake Myvatn in Iceland Choose a match consume the lake algae. However, studies show that the presence of these larvae increases the growth rate of the algae by facilitating nutrient turnover and increasing nutrient availability to the algae. Parasitism Orchids are small epiphytes that grow high in tree branches where they are safe and can access sunlight. Commensalism The tree is unaffected by the orchid's presence. Mutualism Fleas live on the skin of cats and survive by feeding on their blood, which can cause rashes, itching and other health problems for the cat