Biology

Biology

What makes living things tick: from cells to the body to whole ecosystems.

Topics build on each other, but feel free to explore anywhere.

Cells & the body

8 topics · 80 exercises

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1The cell10 exercises 2Animal & plant cells10 exercises 3Organs & organ systems10 exercises 4Nutrition & nutrients10 exercises 5Digestion10 exercises 6Breathing & circulation10 exercises 7Nerves & senses10 exercises 8Skeleton & muscles10 exercises

Health & the body

9 topics · 84 exercises

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1Heart & circulation10 exercises 2Blood types8 exercises 3Immune system10 exercises 4Hormones10 exercises 5Sleep & the body clock8 exercises 6Kidneys & excretion10 exercises 7Human reproduction10 exercises 8Health & disease10 exercises 9Vitamins & minerals8 exercises

Plants

7 topics · 68 exercises

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1Plants & their parts10 exercises 2Photosynthesis10 exercises 3Water transport in plants10 exercises 4Growth and tropisms10 exercises 5Flowers & pollination10 exercises 6Seed dispersal8 exercises 7Fungi10 exercises

Diversity & heredity

8 topics · 80 exercises

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1Classifying life10 exercises 2Microorganisms10 exercises 3Evolution10 exercises 4Evidence for evolution10 exercises 5Heredity10 exercises 6Inheritance patterns10 exercises 7DNA & genes10 exercises 8Mutations10 exercises

Behaviour & adaptation

5 topics · 50 exercises

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1Animal behaviour10 exercises 2Adaptation to habitat10 exercises 3Animal senses10 exercises 4Seasonal behaviour10 exercises 5Camouflage & defence10 exercises

Ecology

9 topics · 86 exercises

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1Ecosystems10 exercises 2Food chains & webs10 exercises 3Biomes of the Earth10 exercises 4Populations & balance10 exercises 5Invasive species8 exercises 6Nutrient cycles10 exercises 7Symbiosis and relationships10 exercises 8Biodiversity and protection10 exercises 9Coral Reefs8 exercises