system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Islands like Hawaii seem to very quickly get diverse vegetation even though they pop up in the middle of the ocean, so where do the first seeds come from?
gpt
Seeds travel in many ways.  Some get there by water, traveling on air currents (think dandelion) or by animals (bird eats seed, undigested seed from excrement finds new home), and by humans.  

In Hawaii's case, many of their trees and plants were brought to the island by early settlers.  
Edit: removed inaccurate information about the quantity of native flora and fauna. Thanks for correct info!