Explain how human activity can impact the limiting factors of river ecosystems.

Through pollution and uncontrolled and untreated discharge of waste into river bodies.

Explanation:

Some of the common limiting factors of any water ecosystem are -  

a) turbidity,  

b) temperature,  

c) pH level, and  

d) dissolved oxygen

Human activities have interfered with the water ecosystem adversely. The water pollution has affected all the limiting factors of river ecosystem .  

Addition of pollutants from industries and sewage system increase the turbidity of river water.  

The temperature of river ecosystem also increases because of the increased organic productivity of the rivers . This happens due to discharge of organic matter in river ecosystem.

pH are also destablised by addition of industrial and sewage effluents

And dissolved oxygen also reduced because of increased organic productivity of river ecosystem.  

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

i need an image of the diagram