Which of the following statements about protozoans is correct?

Protozoans are a diverse group of unicellular organisms that belong to the kingdom Protista. They are classified based on their mode of nutrition and behaviour and can be found in a variety of environments, including freshwater, saltwater, and soil.

Protozoans are eukaryotic, which means they have a true nucleus and other membrane-bound organelles within their cells. This distinguishes them from prokaryotes, which lack a nucleus and other membrane-bound organelles.

Animal-like protozoans obtain their energy by feeding on other organisms, either by ingestion (holozoic nutrition) or by absorbing nutrients from a host organism (parasitic forms). Plant-like protozoans, also known as algae, obtain their energy through photosynthesis, like plants.