Levels of organization (2). worksheet - Free Printable

Let's solve this "Levels of Organization" drag-and-drop activity by matching each description to the correct level: Cells, Tissues, Organs, Organ Systems, Organisms.

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🔍 Step-by-step Analysis:

We have five categories:
1. Cells
2. Tissues
3. Organs
4. Organ Systems
5. Organisms

And we are given five descriptions (one for each level). We need to match each description to its correct category.

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✔ Matching Descriptions to Levels:

#### 1. Cells
> "All living things are made up of cells."
> "Cells are the smallest parts and the basic building blocks of all living things."

✔ These two sentences clearly describe cells as the fundamental unit of life.

➡️ Match: Cells

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#### 2. Tissues
> "Tissues are groups of similar cells."
> "They work together and perform a function."

✔ This defines tissues — groups of similar cells working together to perform a specific function (e.g., muscle tissue, nerve tissue).

➡️ Match: Tissues

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#### 3. Organs
> "Organs are made up by the union of several tissues that are organized and work together."

✔ Organs (like the heart or liver) consist of multiple tissues working together.

➡️ Match: Organs

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#### 4. Organ Systems
> "An organ system is a group of organs with related functions."
> "They work together to perform body functions."

✔ Example: The circulatory system includes the heart, blood vessels, and blood — all working together.

➡️ Match: Organ Systems

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#### 5. Organisms
> "A living thing: human beings, animals, plants."
> "Living things can carry out the vital functions."

✔ An organism is a complete living being made up of all the previous levels.

➡️ Match: Organisms

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🧩 Final Answer (Drag and Drop):

| Level | Description |
|----------------|-----------|
| CELLS | • All living things are made up of cells.<br>• Cells are the smallest parts and the basic building blocks of all living things. |
| TISSUES | • Tissues are groups of similar cells.<br>• They work together and perform a function. |
| ORGANS | • Organs are made up by the union of several tissues that are organized and work together. |
| ORGAN SYSTEMS | • An organ system is a group of organs with related functions.<br>• They work together to perform body functions. |
| ORGANISMS | • A living thing: human beings, animals, plants.<br>• Living things can carry out the vital functions. |

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📌 Summary of the Levels of Organization (from simplest to most complex):

1. Cells → Basic units
2. Tissues → Groups of similar cells
3. Organs → Made of tissues
4. Organ Systems → Groups of organs
5. Organisms → Complete living things

This hierarchy shows how life builds from simple to complex structures.

✔ You’ve now correctly matched all descriptions!