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4. The vorticella stay in one place, attached by a chord to whatever object they can find. However, it has cilia on its top that spin in a circle, creating a vortex for food to come down.

5. Spirogyra seaweed is an autotroph that uses photosynthesis to make food. Because of that, it is at the bottom of the food chain, eaten by small fish and microorganisms. Because of how it makes its food, Spirogyra makes the water it inhabits eutrophic, or rich in minerals. This helps other autotrophs make food, and thus greatly benefits the ecosystem.