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All life on Earth is made from cells. Without cells, there can be no life.

Almost all cells are so small that you need a to see them. Some organisms, like are made of only one cell. These are unicellular organisms . Others, like trees and blue whales, are made from millions or even billions of cells. These are multicellular organisms. These often have different types of cells, each with a different function. These are .

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Find out what animal and plant cells are and learn what the function of the cell wall and the nucleus is in this KS3 Bitesize biology article.

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All life on Earth is made from cells. Without cells, there can be no life.

Almost all cells are so small that you need a to see them. Some organisms, like are made of only one cell. These are unicellular organisms . Others, like trees and blue whales, are made from millions or even billions of cells. These are multicellular organisms. These often have different types of cells, each with a different function. These are .

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All life on Earth is made from cells. Without cells, there can be no life. Almost all cells are so small that you need a to see them. Some organisms, like are made of only one cell. These are unicellular organisms . Others, like trees and blue whales, are made from millions or even billions of cells.

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Use this knowledge organiser to produce a set of flash cards on the key words and definitions.
Produce a mind-map on the essential knowledge
Follow the links to carry out further reading in this subject area.

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Muscles cells are found in bundles which make up our muscles. These cells are able to contract (get shorter) and relax (return to original length). There are different types of muscle cell, each perfectly adapted to its function:

Cardiac (heart) muscle cells contract and relax to pump blood around our bodies for our entire lives. They never get tired.

Smooth muscle cells make up thin sheets of muscle, such as the stomach lining. They can also be arranged in bundles, or rings, like that in the anus.

Skeletal muscle is joined to bones. Its cells contract to make bones move and joints bend.

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Animal cells are specialised for the function they perform. Find out more with Bitesize. For students between the ages of 11 and 14.

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Essential KO YR8 Cells 2 - Cell Transport

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Use this knowledge organiser to produce a set of flash cards on the key words and definitions.
Produce a mind-map on the essential knowledge
Follow the links to carry out further reading in this subject area.

# data[].attributes.body
Use this knowledge organiser to produce a set of flash cards on the key words and definitions.
Produce a mind-map on the essential knowledge
Follow the links to carry out further reading in this subject area.

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The role of diffusion in and within cells

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Diffusion helps to transfer substances between cells. Find out more with Bitesize. For students between the ages of 11 and 14.

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The particle model of matter - KS3 Chemistry - BBC Bitesize

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KS3 Chemistry The particle model of matter learning resources for adults, children, parents and teachers.

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- When a solid is heated, it absorbs energy and it melts, turning into a liquid.

- If the liquid is heated, it absorbs more energy and it boils, turning into a gas.

These changes absorb energy from the surroundings so they are .

Evaporating is when a liquid turns into a gas slowly, at temperatures that are below its . Puddles dry up because they - they don't boil.

Cooling down

Condensing - If a gas is cooled, it transfers energy to the surroundings, and turns into a liquid.

- If the liquid is cooled, it transfers energy to the surroundings, and turns into a solid.

These changes transfer energy to the surroundings so they are .

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When a solid is heated, it absorbs energy and it melts, turning into a liquid. - If the liquid is heated, it absorbs more energy and it boils, turning into a gas. These changes absorb energy from the surroundings so they are .

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The particles in solids are very close together, therefore they cannot usually be compressed or squashed. of attraction between the particles hold them together and keep them in place.

The particles in solids are arranged in a regular way. The particles in solids move only by vibrating about a fixed position. This gives solids a fixed shape and means that they cannot flow like liquids.

The hotter a solid gets, the faster its particles vibrate. This means that solids expand when they are heated.

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The particles in solids are very close together, therefore they cannot usually be compressed or squashed. of attraction between the particles hold them together and keep them in place. The particles in solids are arranged in a regular way. The particles in solids move only by vibrating about a fixed position.

# data[].attributes.attachment_link.readable_text
- When a solid is heated, it absorbs energy and it melts, turning into a liquid.

- If the liquid is heated, it absorbs more energy and it boils, turning into a gas.

These changes absorb energy from the surroundings so they are .

Evaporating is when a liquid turns into a gas slowly, at temperatures that are below its . Puddles dry up because they - they don't boil.

Cooling down

Condensing - If a gas is cooled, it transfers energy to the surroundings, and turns into a liquid.

- If the liquid is cooled, it transfers energy to the surroundings, and turns into a solid.

These changes transfer energy to the surroundings so they are .

# data[].attributes.attachment_link.description
When a solid is heated, it absorbs energy and it melts, turning into a liquid. - If the liquid is heated, it absorbs more energy and it boils, turning into a gas. These changes absorb energy from the surroundings so they are .

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The role of diffusion in and within cells

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Diffusion helps to transfer substances between cells. Find out more with Bitesize. For students between the ages of 11 and 14.

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In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on.

After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

This is now known as the Law of Conservation of Energy which means that energy doesn't appear or disappear.

Energy can be transferred between different stores of energy.
the total energy stored before = total energy stored after.
For example:

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In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on. After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

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In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on.

After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

This is now known as the Law of Conservation of Energy which means that energy doesn't appear or disappear.

Energy can be transferred between different stores of energy.
the total energy stored before = total energy stored after.
For example:

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In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on. After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

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KS3 Physics Waves learning resources for adults, children, parents and teachers.

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Features of waves test questions - KS3 Physics Revision - BBC Bitesize

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Study the different features of waves with BBC Bitesize KS3 Science.

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Sound waves test questions - KS3 Physics Revision - BBC Bitesize

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Learn about the properties of sound waves and how we calculate the speed of sound with BBC Bitesize KS3 Science.

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How does diet affect the body? Find out in with BBC Bitesize Biology. For students between the ages of 11 and 14.

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How does diet affect the body? Find out in with BBC Bitesize Biology. For students between the ages of 11 and 14.

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The between the in a are weaker than the forces between particles in a , so the particles are not held in fixed positions.

The particles in a liquid are still close together, like the particles in a solid, but are arranged randomly. As well as vibrating, the particles in a liquid can move from place to place.

When drawing the particles in a liquid, they should be closely spaced with very few gaps, in a random arrangement.

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The between the in a are weaker than the forces between particles in a , so the particles are not held in fixed positions. The particles in a liquid are still close together, like the particles in a solid, but are arranged randomly.

# data[].attributes.attachment_link.readable_text
The between the in a are weaker than the forces between particles in a , so the particles are not held in fixed positions.

The particles in a liquid are still close together, like the particles in a solid, but are arranged randomly. As well as vibrating, the particles in a liquid can move from place to place.

When drawing the particles in a liquid, they should be closely spaced with very few gaps, in a random arrangement.

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The between the in a are weaker than the forces between particles in a , so the particles are not held in fixed positions. The particles in a liquid are still close together, like the particles in a solid, but are arranged randomly.

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Chemical reactions - KS3 Chemistry - BBC Bitesize

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KS3 Chemistry Chemical reactions learning resources for adults, children, parents and teachers.

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If you carry out an investigation you will record evidence of any changes. The evidence you record is called data and it may be quantitative or qualitative.
Quantitative data
Quantitative data can be counted, measured, and expressed using numbers.

Quantitative data can be discrete (counted) or continuous (measured).

For example, if a reaction releases a lot of energy we can use a thermometer and measure the temperature rise in degrees Celsius (C).
Qualitative data (words)
Qualitative data describes qualities or characteristics which are often observable.

For example, "the colour changed from white to blue".

You must always state what the colour was and what it changed too.

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If you carry out an investigation you will record evidence of any changes. The evidence you record is called data and it may be quantitative or qualitative. Quantitative data Quantitative data can be counted, measured, and expressed using numbers. Quantitative data can be discrete (counted) or continuous (measured).

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Plants use photosynthesis to transform energy from sunlight into a usable form. Find out more with Bitesize. For students between the ages of 11 and 14.

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Learn what photosynthesis is and how plants use photosynthesis to transform energy from sunlight into a usable form with this KS3 Bitesize biology guide.