Ineed your explain the effect humans have had on espanola's giant tortoise populaition.
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This Is a very hard question but I'll give a list of what I personally think/know

1. Some humans kill the turtles for their shels
2. We also destroy alot of their homes
3. Pollution
4. but at the same time we can help some by putting them in zoos
5. And in some places we have shealter for them were we help injured/hungry/needing turtles

I hope I helped