### Answer

The correct answer is **cells**.

Every organism, regardless of its size or complexity, is fundamentally composed of cells. Cells are the basic structural and functional units of life. They can exist as independent entities, such as in unicellular organisms like bacteria, or as part of multicellular organisms like blue whales, which have trillions of cells grouped into various tissues, organs, and organ systems.

While tissues are made up of groups of similar cells, organs are structures made from different types of tissues, and organ systems consist of different organs working together to perform complex functions. Thus, every living organism begins with cells, making this the most accurate answer in the context of the question presented.

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### Answer

The correct answer is **cells**.

Every organism, regardless of its size or complexity, is fundamentally composed of cells. Cells are the basic structural and functional units of life. They can exist as independent entities, such as in unicellular organisms like bacteria, or as part of multicellular organisms like blue whales, which have trillions of cells grouped into various tissues, organs, and organ systems.

While tissues are made up of groups of similar cells, organs are structures made from different types of tissues, and organ systems consist of different organs working together to perform complex functions. Thus, every living organism begins with cells, making this the most accurate answer in the context of the question presented.

Knowee AI · Accepted Answer

### Answer

The correct answer is **cells**.

Every organism, regardless of its size or complexity, is fundamentally composed of cells. Cells are the basic structural and functional units of life. They can exist as independent entities, such as in unicellular organisms like bacteria, or as part of multicellular organisms like blue whales, which have trillions of cells grouped into various tissues, organs, and organ systems.

While tissues are made up of groups of similar cells, organs are structures made from different types of tissues, and organ systems consist of different organs working together to perform complex functions. Thus, every living organism begins with cells, making this the most accurate answer in the context of the question presented.

Whether bacterium or blue whale, every organism is made ofMultiple choice question.cells.tissues.organs.organ systems.

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