Learn the Ideas
1Life cycles repeat.
Born → grow → reproduce → (offspring repeat the cycle). Amphibians, insects, birds, mammals and plants all have one.
2Some change dramatically.
Insects and amphibians go through metamorphosis: egg → larva → pupa → adult (butterfly), or egg → tadpole → frog.
3Offspring inherit features.
Young resemble their parents because features are passed on — but they vary, which over long times drives evolution.
Worked Example
How is a frog's life cycle different from a cat's?
Watch Out! Common Mistakes
Similar, not identical! Young inherit features but vary — different from each other and their parents. That variation matters for evolution.
Most mammals don’t! Mammals usually give birth to live young. Birds, most reptiles, amphibians, fish and insects lay eggs.
Egg first! Butterfly: egg → larva (caterpillar) → pupa (chrysalis) → adult. The pupa is the resting, transforming stage.
⬇ Cheat Sheet
- Life cycle: born → grow → reproduce → repeat.
- Metamorphosis: egg → larva → pupa → adult (insects); egg → tadpole → frog.
- Mammals give birth to live young that grow into adults.
- Offspring inherit features but vary — the basis of evolution.
📖 Continue Your Journey
Quick summary
- Every living thing has a life cycle: born, grow, reproduce, repeat.
- Insects and amphibians undergo metamorphosis; mammals grow without changing form.
- Most mammals give birth to live young; many other animals lay eggs.
- Offspring inherit features but vary — the basis of evolution over time.
Frequently asked questions
What is metamorphosis?
A dramatic change in body form during a life cycle — a butterfly goes egg → caterpillar → chrysalis → adult, and a frog goes egg → tadpole → frog.
Are offspring identical to their parents?
No — they inherit features and resemble their parents, but they vary from them and from each other. This variation drives evolution over many generations.
Do all animals lay eggs?
No — most mammals give birth to live young, while birds, most reptiles, amphibians, fish and insects lay eggs.
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