Lesson 5 of 13 · 7 min
Cells: the building blocks of life
All living things are made of cells — tiny units of life. Some living things are a single cell; others, like us, have trillions. Cells group into tissues, tissues into organs (like the heart), and organs into systems.
🦠 → 🟨 → 🧑
Cells → organs → whole body
Let’s try it! ✍️
Question 1 of