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🦈 Sharks: 400 million years of design

Trace how ancient shark lineages reshaped jaws, teeth, skin, senses, fins, and life cycles across 400 million years of evolution.

4
lessons
~30 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. A body plan from ancient seasUse fossils and living anatomy to explain what persisted and changed in shark evolution.Sharks have a deep, branching history, reconstructed mainly from durable teeth and scales plus rare body evidence.
  2. The tools of a hunterConnect jaws, replaceable teeth, and multiple senses with different hunting strategies.Shark feeding is a coordinated design involving flexible jaws, continuous tooth replacement, and layered sensory information.
  3. Moving through waterExplain how skin, fins, buoyancy, and head shape solve different movement problems.Shark bodies are trade-offs for drag, lift, stability, steering, and habitat rather than one universal speed machine.
  4. Survival through upheavalEvaluate shark resilience while recognizing extinction, preservation bias, and present-day risks.Sharks survived repeated upheavals by diversifying, but ancient success does not guarantee survival under rapid modern change.

Questions this course answers

Why are shark teeth especially important to paleontologists?

Hard mineralized teeth commonly survive after the rest of a shark's body decays.

What do ampullae of Lorenzini detect?

These sensory organs detect weak electric signals from nearby animals and the environment.

What is one role of dermal denticles?

The tooth-like skin structures affect surface flow and provide protection.

Why is ‘living fossil’ a poor complete description of sharks?

Shark lineages show both deep continuity and extensive evolutionary change.

What does the fossil record of sharks do best?

Teeth and scales preserve well, but missing cartilage and soft tissue make the record incomplete.

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