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Biology: cells, the human body & genes

Step 2 of 7 in Science Center

Next in your path: 15.6 Earth, Weather & Climate Science

What you'll be able to do
  • Explain what makes something alive and why the cell is the basic unit of life.
  • Name the main parts of plant and animal cells and what each part does.
  • Describe the main systems of the human body and how they work together.
  • Explain how germs spread and how hand washing helps stop them.
  • Explain DNA, genes and chromosomes, and how traits pass from parents to children.

This course is general science education, not medical advice. For questions about your own health, talk to a doctor, nurse or pharmacist.

Words in this course 29Open the Vocabulary Hall
01

What is life? Meet the cell

In simple words

A puppy is alive. A rock is not. Living things eat, grow, and make babies. And every living thing is built from tiny rooms called cells, the way a house is built from bricks.

Key facts
  • Scientists usually say living things: are made of cells, use energy (food or sunlight), grow, respond to their surroundings, and reproduce.
  • Cell theory (a core idea in biology): all living things are made of one or more cells; the cell is the basic unit of life; new cells come from existing cells.
  • Some living things are just one cell (bacteria, yeast). Others, like people and trees, are made of trillions.
  • In 1665, Robert Hooke published Micrographia. Looking at thin slices of cork under his microscope, he saw little box-like compartments and called them "cells" because they reminded him of small monastery rooms.
  • Most cells are too small to see without a microscope.
Step by step
  1. Write the signs of life: made of cells, uses energy, grows, responds to surroundings and reproduces.
  2. Pick three things (a tree, a rock, a dog) and tick which signs each one shows.
  3. Read the three ideas of cell theory: all living things are made of cells, the cell is the basic unit of life and new cells come from existing cells.
  4. Note that some living things are one cell (bacteria, yeast) and others have trillions.
  5. Remember Robert Hooke looked at cork in 1665 and saw tiny compartments he called cells.
  6. Check: you can explain why a rock is not alive.
LESSON 01What is life? Meet the cell
LESSON 01 / ANIMATED LESSON / AI VOICE00:00 / 01:00
Read the video script
[Host, holding a cork from a bottle] "In 1665, a scientist named Robert Hooke sliced cork this thin and looked through a microscope."
[Screen: drawing of cork cells like a honeycomb] "He saw tiny boxes and called them cells."
[Text on screen: all living things are made of cells] "Today we know every living thing is made of cells. You. Your dog. The tree outside."
[Host] "Some living things are a single cell. You are made of trillions of them."
Try it now

Make an "Alive or not?" chart. List 10 things around you (a plant, a cat, a rock, a phone, bread mould, a cloud...). For each, tick which signs of life it shows: cells, uses energy, grows, responds, reproduces. Decide: living, never alive, or once alive (like a wooden table).

ClaudeStuck? Copy a ready-made prompt for Claude

Copy this, open Claude, paste it, and Claude will walk you through the lesson step by step.

For a grown-up: Claude is for adults (18+). Copy this, paste it into Claude, and use the answer to explain the lesson to your child.

I'm learning "Biology: cells, the human body & genes" on The Future Market. Lesson 1: "What is life? Meet the cell".

What the lesson teaches:
- Scientists usually say living things: are made of cells, use energy (food or sunlight), grow, respond to their surroundings, and reproduce.
- Cell theory (a core idea in biology): all living things are made of one or more cells; the cell is the basic unit of life; new cells come from existing cells.
- Some living things are just one cell (bacteria, yeast). Others, like people and trees, are made of trillions.
- In 1665, Robert Hooke published Micrographia. Looking at thin slices of cork under his microscope, he saw little box-like compartments and called them "cells" because they reminded him of small monastery rooms.
- Most cells are too small to see without a microscope.

The exercise I'm working on:
Make an "Alive or not?" chart. List 10 things around you (a plant, a cat, a rock, a phone, bread mould, a cloud...). For each, tick which signs of life it shows: cells, uses energy, grows, responds, reproduces. Decide: living, never alive, or once alive (like a wooden table).

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.
I'm a parent helping my child (about 8 years old) with a lesson called "What is life? Meet the cell" from the course "Biology: cells, the human body & genes".

Here's what the lesson says:
A puppy is alive. A rock is not. Living things eat, grow, and make babies. And every living thing is built from tiny rooms called cells, the way a house is built from bricks.

The activity:
Make an "Alive or not?" chart. List 10 things around you (a plant, a cat, a rock, a phone, bread mould, a cloud...). For each, tick which signs of life it shows: cells, uses energy, grows, responds, reproduces. Decide: living, never alive, or once alive (like a wooden table).

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.
Open Claude
Sources
My notes
02

Inside a cell

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03

Your body's systems

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04

Germs and your immune system

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05

DNA, genes and chromosomes

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06

Heredity: why you look like your family (and not exactly)

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++

Final project

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??

Quiz

  1. What are the three main ideas of cell theory?

  2. Who named "cells," and what was he looking at?

  3. Which cell part holds the DNA?

  4. Name two parts plant cells have that animal cells don't.

  5. How many bones does an adult human skeleton have?

  6. Which body system carries oxygen around the body?

  7. How long does public health guidance say to wash hands with soap and water?

  8. In DNA, which base pairs with A, and which pairs with C?

  9. How many chromosomes do humans normally have?

  10. Whose X-ray images helped reveal the double helix in 1953?

  11. What plant did Gregor Mendel use for his experiments?

  12. What does "dominant" mean for an allele?

EX

Final exam

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CE

Certificate

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