A biogeochemical cycle is a pathway by which a chemical substance moves through both biotic and abiotic compartments of earth
        
                    
             
        
        
        
An insect with coloration to prevent from being detected by a predator would be an example of Camouflage.
<h3>What is the importance of Camouflage?</h3>
Camouflage, commonly characterized as cryptic coloring, is a defensive tactic used by organisms to obscure their appearance, generally in order to blend in with their environment. 
Camouflage is utilized by organisms to hide their location, identity, and movement. This enables prey to evade predators while also allowing predators to sneak up on victims.
An insect with coloration to avoid being detected by a predator would be an example of Camouflage.
Thus, the correct answer is Camouflage.
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C they are always found in homologous pairs
        
             
        
        
        
The biodiversity will decrease due to an increase in pollution is the effect will have on the biodiversity on the river ecosystem.
Option A
<u>Explanation:</u>
Biodiversity is the actual collection of total amounts of flora and fauna present in a particular ecosystem. The river ecosystem consists of the aquatic plants, the aquatic animals like fishes,etc and even the surrounding land plants and animals, who utilize the river water for their living. 
The inclusion of the polluted sewage of the surrounding area into the river directly mixes several chemicals to the water, which are potentially harmful for all the animals living there. This leads to destruction of the flora and fauna of both water and lands surrounding them. This hampers the biodiversity of the water as well as surrounding land.