Canals facility a faster distribution of good market this is an example of- A positive modification of the physical environment
A negative modification of the physical environment
A positive neutral modification of the environment
A negative neutral modification of the environment

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Answertaurus is the highest in the sky;

Answer is b)eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the watereutrophication occurs when there are excess nutrients in a body of water. this results in plants having more food and reproducing  more, sometimes leading to more aquatic animal life as well. ultimately, this can reduce the oxygen level in the ecosystem.