The diagram given shows a river flowing quickly towards the ocean and what happens to two different kinds of pollutants when they enter it. The pollutants that are mentioned in the diagram are fertilisers from farming and heavy metals from industry. The fertilisers are shown as blue spots, while the heavy metals are shown as black spots.

It is clear that the pollutants from industry stay in the river for a longer period of time than the pollutants from farming. According to the diagram. plants growing on the river bed remove fertilisers from the water through a process called nitrogen fixation. However, they do not absorb heavy metals in the same way. These industrial pollutants cither sit on the bottomn of the river or flow into the sea.

Therefore, the effects of heavy metals on the environment probably continue for longer than those of fertilisers.

Coming soom.

Given is a diagram illustrating the interaction between two types of pollutants - namely fertilisers from farming and heavy metals produced by industry-and the ecosystem of a fast flowing river. The fertilisers are denoted by blue spots, while the heavy metals are marked as black spots.

From the information supplied, it is evident that fertilisers are more readily removed from the water through natural processes than heavy metals, and that the latter tend to remain in a river system for much longer periods of time. In the lower section of the diagram, plants growing on the river bed are shown to absorb fertilisers from the water through a process known as nitrogen fixation. By contrast, heavy metals are not filtered from the river system in this way and instead either settle on the bottom or are emptied into the sea.

Thus, it is reasonable to surmise that the effect of heavy metals on the environment is longer lasting than that of fertilisers.