Which of the following are considered the simplest organisms in the animal kingdom?

Name: Which of the following are considered the simplest organisms in the animal kingdom?
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Protozoa are considered the simplest organisms in the animal kingdom as they are unicellular and lack specialized tissues and organs. Bacteria are not considered animals, fungi are more complex than protozoa, and viruses are not even considered living organisms by some definitions.

Which of the Following Are Considered the Simplest Organisms in the Animal