Which of the following human activities could have an irreversible effect on an ecosystem? i. introducing a new species ii. urban sprawl iii. introducing a new chemical iv. over-hunting

It is all of them

Explanation:I just had the question

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

d.) circle motion requires a force to give it a centripetal acceleration.