Members of which of the following groups can be single-celled producers?

Question

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Both bacteria and protista can include single-celled producers. Plantae are generally multicellular and photosynthetic, while bacteria include various types of single-celled organisms that can be autotrophic or heterotrophic. Protista represent a diverse group of eukaryotes, among which there are unicellular and colonial types that can photosynthesize or ingest food.

Members of Which of the Following Groups Can Be Single-Celled