Answer:
cold so I think b and it would be hard to breathe
The correct answer is choice A.) Fish die from lack of oxygen due to an algal bloom. B would not likely be caused by any sort of biological water pollution, and choice D would most likely be caused by humans. Choice C could be an option as well, but can be caused by human activity, such as removal of plants keeping erosion of soil at bay, which washes more and more sediment to bodies of water. Hope this helped!
It is important because with any shape its no use like a can, without a can.
