Life on Earth

Quizzes on the living world — record-breaking animals, birds and their dinosaur ancestry, plant survival, and life in the deep sea.

The living world is stranger than any invented one. An octopus runs on three hearts, the fastest animal on the planet is a bird in a dive rather than anything on four legs, and the reefs that shelter a quarter of marine species are built by animals barely visible on their own. These quizzes cover animals and their records, birds and the dinosaur lineage they never quite left, how plants feed and survive a winter, the physics and inhabitants of the ocean, and the cell biology sitting under all of it. Written for curiosity rather than exams — the explanations are where most of the learning happens.

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Biology

Cells, Genes & Evolution

From the inside of a cell to the logic of natural selection.

Sample question

What is generally considered the basic unit of life?

10 questions 7 min Answers explained
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Easy
Biology

Ecosystems & Food Webs

Who eats whom, what happens to the energy along the way, and why removing one species can change everything.

Sample question

What is an organism that breaks down dead material called?

10 questions 6 min Answers explained
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Medium
Biology

Evolution & Natural Selection

How the mechanism actually works, what it acts on, and the evidence that convinced biologists it does.

Sample question

On which ship did Charles Darwin make the voyage that shaped his thinking?

10 questions 8 min Answers explained
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Hard
Biology

Genes, Alleles & Inheritance

Base pairs, codons, alleles and the arithmetic of what gets passed on — ten harder questions on genetics.

Sample question

In DNA, which base always pairs with adenine?

10 questions 9 min Answers explained
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Biology

Inside the Living Cell

Ten questions on the machinery packed inside a single cell, from ribosomes to the membrane that holds it together.

Sample question

Which cell structure assembles proteins from amino acids?

10 questions 7 min Answers explained
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Hard
Birds

Beaks, Diets and Hunting

Ten bills, tongues and stomachs, and the food each of them evolved to handle.

Sample question

A flamingo feeds by doing what?

10 questions 7 min Answers explained
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Easy
Birds

Feathers, Flight & Song

Record holders, adaptations and the dinosaur connection.

Sample question

What is the largest living bird species?

10 questions 6 min Answers explained
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Medium
Birds

Nests, Eggs and Raising Chicks

Brood patches, egg tricks and the birds that hand the whole job to one parent.

Sample question

A bird that hatches covered in down and able to walk almost at once is described as what?

10 questions 6 min Answers explained
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Hard
Oceans & Marine Life

Life in the Deep Sea

Bioluminescence, vent communities and the slow economy of a world without sunlight.

Sample question

Which name is given to the ocean layer below roughly 1,000 metres, where sunlight never…

10 questions 7 min Answers explained
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Easy
Plants & Gardening

A Gardener's Year

Mulch, pH, grafting and hardening off — the reasoning behind the repeated jobs.

Sample question

What does mulching a bed with bark or compost mainly achieve?

10 questions 6 min Answers explained
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Plants & Gardening

The Lives of Trees

Rings, heartwood, fungal partners and the physics of lifting water thirty metres.

Sample question

What do the rings visible in a cut tree trunk record?

10 questions 7 min Answers explained
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Medium
Science & Nature

The Animal Kingdom

Record-breakers, oddities and the rules that sort the living world.

Sample question

What is the largest animal ever known to have lived?

10 questions 8 min Answers explained
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Easy
Science & Nature

The Human Body

The remarkable machine you live in, from your bones to your immune system.

Sample question

What is the largest organ of the human body?

10 questions 6 min Answers explained
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Medium
Science & Nature

The Human Brain

Three pounds of tissue, eighty-six billion neurons, and the most complex object we know of.

Sample question

Which is the largest part of the brain, responsible for thought and voluntary movement?

11 questions 8 min Answers explained
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Easy
Science & Nature

Weather & Climate

Clouds, fronts, storms and the difference between a rainy day and a warming world.

Sample question

In which layer of the atmosphere does nearly all weather occur?

10 questions 6 min Answers explained
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