浮游动物包含各种各样的小生物体，从单细胞原生动物到水母、磷虾和桡足类动物，为海洋食物链提供了基本的链接。

The zooplankton, which encompass a wide range of little organisms from single-cell protozoa to creatures such as jellyfish, krill and copepods, provide the basic link in the ocean food chain.

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研究人员一度以为，只有单细胞生物，如原核生物和原生动物，才能在深海缺氧环境中生活。

Researchers had thought that only single-celled organisms such as prokaryotes and protozoa could live in the oxygen-deprived environments of the deepest ocean.

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病毒已知感染动物，植物，真菌，原生动物，古菌和细菌。

Viruses are already known to infect animals, plants, fungi, protozoa, archaea, and bacteria.

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Parasitic organisms like protozoa and worms which are - which can cause terrible diseases.

而某些寄生生物,如原生动物和蠕虫,可以引起严重疾病

耶鲁公开课 - 生物医学工程探索课程节选