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Step-by-step explanation:
It is generally believed that the ancestors of land plants, fungi, and animals evolved from a group of single-celled organisms known as protists.
The probable ancestral protist for land plants is believed to be a group of green algae known as the Charophytes. There is evidence that Charophytes are the closest living relatives of land plants, as they share many features with land plants such as cell walls made of cellulose and the ability to carry out photosynthesis. In addition, molecular data supports the hypothesis that Charophytes are the ancestors of land plants.
The probable ancestral protist for fungi is believed to be a group of protists known as the Chytrids. Chytrids are heterotrophic organisms that are similar to fungi in several ways, such as having chitin in their cell walls and producing spores for reproduction. Molecular data also supports the hypothesis that Chytrids are the ancestors of fungi.
The probable ancestral protist for animals is believed to be a group of protists known as the Choanoflagellates. Choanoflagellates are single-celled organisms that have a flagellum (a whip-like appendage) and a collar of microvilli (tiny hair-like structures) around their cell surface, which are also found in animals. In addition, molecular data supports the hypothesis that Choanoflagellates are the ancestors of animals.
Overall, the evidence that connects these protists to modern organisms includes both morphological and molecular data. Morphological data refers to the physical characteristics and features of the organisms, while molecular data refers to the genetic and biochemical similarities between different organisms.