Examples
- When you pick up a pencil, your fingernail helps you hold it tightly
- Fingernails keep your fingers from getting scratched when you dig in the dirt
- A cat's claws are like human fingernails, they help them climb and catch prey
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See also
- What are fitness trade-offs?
- What are evolutionary pressures?
- What are human fingerprints?
- Why did life not evolve to use radio?
- What does adjust their growth mean?