Resolving the relationship between the various kingdoms has been challenging because species often resemble one another; for example, the kingdom _____ contain some organisms that are animal-like and others that are plantlike.

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The kingdom Protista is known for its diversity, containing organisms that share characteristics with both animals and plants. This makes it challenging to classify and organize them into distinct categories within the overall tree of life. Bacteria, fungi, and archaea do not typically have this type of variability and are more easily distinguishable from one another.

Resolving the Relationship Between the Various Kingdoms Has Been Challenging