Which of the following best describes the cellular organization of organisms in the kingdom Animalia?

• A. They are exclusively multicellular.
• B. They are acellular.
• C. They can be either unicellular or multicellular.
• D. They are exclusively unicellular.

Answer: (A)

Verified step by step guidance

1. Understand the question: The problem is asking about the cellular organization of organisms in the kingdom Animalia. This requires knowledge of the characteristics of this kingdom in biological classification.
2. Recall the defining traits of the kingdom Animalia: Organisms in this kingdom are eukaryotic, heterotrophic, and lack cell walls. Importantly, they are exclusively multicellular, meaning all members of this kingdom are composed of multiple cells.
3. Eliminate incorrect options: 'Acellular' refers to organisms without cells, which does not apply to Animalia. 'Exclusively unicellular' refers to organisms made of a single cell, which is also incorrect for Animalia. 'Can be either unicellular or multicellular' is incorrect because Animalia does not include unicellular organisms.
4. Confirm the correct answer: The correct description of cellular organization in Animalia is 'They are exclusively multicellular.' This aligns with the biological classification and characteristics of this kingdom.
5. Summarize the reasoning: Organisms in the kingdom Animalia are exclusively multicellular, as this is a defining feature of the kingdom. Other options are inconsistent with the biological traits of Animalia.