Monocerids

例句：

1. 1. Monocerids are a type of single-celled microorganism that can be found in soil and water.
   单细胞微生物是一类可以在土壤和水中发现的单细胞生物。
2. 2. The discovery of monocerids has led to new insights into the evolution of life on Earth.
   发现单细胞生物引发了对地球上生命进化的新见解。
3. 3. Monocerids play a crucial role in nutrient cycling in ecosystems.
   单细胞生物在生态系统中营养循环中起着至关重要的作用。