Courses
Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
3 courses
Transport and Excretion
Biology · High School (9–10), General · Transport in Living Organisms, Excretion, Excretory System, Circulatory System
FreeCh 4 · 3/3
Blood carries food and oxygen to every cell, and plants move water up to their highest leaves. Learn how the heart, the blood vessels, the xylem and the phloem do it, and how kidneys and plants remove wastes.
3Lessons11Problems2Python Labs1Question Set1Mock Test
Respiration: Releasing Energy from Food
Biology · High School (9–10), General · Respiration, Respiratory System
FreeCh 4 · 2/3
Food holds energy, and respiration releases it in every cell. See how glucose is broken down with and without oxygen, how fish, insects and people take in oxygen, and how your lungs work.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Nutrition: How Living Things Get Food
Biology · High School (9–10), General · Nutrition, Digestive System, Photosynthesis
FreeCh 4 · 1/3
Green plants make their own food from light, water and carbon dioxide. Animals and fungi take theirs from others, in different ways. Follow both, and then trace a meal through the human digestive system.
3Lessons12Problems2Python Labs1Question Set1Mock Test