- Humans changing ecosystems usually has a negative impact on an ecosystem / organisms living in an ecosystem
- Humans building homes in an ecosystem causes that ecosystem to change
- So, humans building homes in an ecosystem has a negative impact on an ecosystem and organisms living in the ecosystem

- Humans building homes in an ecosystem has a negative impact on an ecosystem and organisms living in the ecosystem
- A wetland is a kind of ecosystem
- So, humans building homes in a wetland has a negative impact on a wetland and organisms living in the wetland

Therefore, humans building homes in a wetland has a negative impact on a wetland and organisms living in the wetland
[Question]Which of these is most likely harmful to an ecosystem?
[Context]- Humans changing ecosystems usually has a negative impact on an ecosystem / organisms living in an ecosystem 
- Humans building homes in an ecosystem causes that ecosystem to change 
- A wetland is a kind of ecosystem