system
Given the following post, respond as if you're commenting on Reddit:
human
Why does ocean-life have issues with microplastic particles, but not sand particles?

If microplastic and sand particles are roughly the same size, why isn't there more issues with sand in sea creatures as there is with microplastic?
gpt
The wee bugs have had millions of years of evolution dealing with sand... they figured it out. 

The wee bugs have had less than 100 years to deal with plastic  - and the chemicals in plastic mimic several organic chemicals,  so the wee DNA of the wee bugs doesn't know how to respond.