Answer:
DIFFERENCES
COMETS
- May have delivered water to earth
- Probably formed in outer solar system
- Made of rocks, ice and compounds with hydrogen and carbon
- Highly elliptical orbit
- Have a long dust tail
ASTEROIDS
- May have caused mass extinction on earth
- Probably formed inside Jupiter's orbit
- Made of rocks and metals
- Most orbit between Mars and Jupiter
SIMILARITIES
- Both orbit the sun
- Relics of the early solar system
- Both collided with earth
- Not spherical in shape
- Stay in space
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