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Every organism, or living thing, comprises structures called cells. The cell is the smallest unit with the basic properties of life. Some tiny organisms, such as bacteria and yeast, comprise only one cell. Large plants and animals have many billions of cells. Human beings are made up of over 75 trillion cells. The study of cells is a branch of biology.

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Super easy Plant Cell drawing

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What are the differences between these two types?

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Although plant and animal cells have many of the same organelles, there are some notable differences. Plant and animal cells both have a cell membrane, but besides a cell membrane, a plant cell also has a cell wall. The cell wall gives the plant cell structure. Plant cells also contain chloroplasts, green organelles that do photosynthesis. Animal cells do not have chloroplast because they do not do photosynthesis.

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Fun Facts About Cells

They were discovered by the scientist Robert Hooke.

One of the largest known cells is the ostrich egg which can weigh over three pounds.

When many cells of the same kind are together in a group, it's called tissue.

The word cell comes from the Latin word cellula, which means small compartment.

Humans actually carry more bacteria cells than human cells. Yuck!

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HUMAN CELL - The Dr. Binocs Show | Best Learning Videos For Kids | Peekaboo Kidz

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Cell Diffusion Model DIY

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Cell - The basic unit of all living things.

Organelle - Parts of a cell that help it function.

Nucleus - The organelle that contains DNA, the genetic material of the cell.

Cytoplasm - The jelly-like liquid inside the cell where the organelles are found.

Cell Membrane - The thin, flexible barrier surrounding the cell.

Cell Wall - Found outside the cell membrane, this organelle gives the plant structure. Animal cells do not have cell walls.

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Discussion Questions

How are we able to see cells?

Are all cells the same? Explain.

What are some of the different parts of a cell?

How are animal cells and plant cells different?

Why is it important for scientists to know about cells?

What is the difference between a unicellular organism and a multicellular organism?

Why is the mitochondria of a cell important?

What function does a cell wall serve for a plant?

Describe what you might see if you were to look at cells through a microscope.