🔬 Single-Cell Organisms – The Tiny Life Forms

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🧫 What is a single-cell organism?

A single-cell organism is a living thing made of just one cell.

👉 That one tiny cell does everything:

• Eats 🍽️
• Grows 🌱
• Moves 🚶
• Reproduces 👶

Even though they are tiny, they are alive!

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🦠 Examples of single-cell organisms

Some common ones are:

• Bacteria
• Amoeba
• Paramecium
• Yeast

🔍 Most are so small that we can see them only with a microscope.

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🌍 When did they appear?

• Single-cell organisms appeared about 3.5 billion years ago.
• At that time, there were no plants, animals, or humans.

They were the first living things on Earth 🌍

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⏳ How long did they rule the Earth?

🧠 This is amazing!

• Single-cell organisms ruled the Earth for about
  3 billion years 🦠👑
• During that time, they were the only life forms on the planet.

👉 Humans have been around for only about 300,000 years — very short compared to them!

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🌱 Why are they important?

Single-cell organisms:

• Made oxygen in the air 🌬️
• Helped form soil
• Are the ancestors of all plants and animals (including us!)

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🧠 Easy to remember

Before plants and animals, tiny single cells were the kings of Earth 👑🦠

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⭐ Fun facts for kids

• 🦠 Some single-cell organisms can live in hot volcanoes
• ❄️ Some live in ice
• 🧬 Your body is made of trillions of cells
• 🥖 Yeast (a single-cell organism) helps make bread rise

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