Assume the following event and the causes and write it:
The fear of disappearance of so many indigenous fishes.

Assume the following event and the causes and writ it: The fear of disappearance of so many indigenous fishes.

Assume the following event and the causes and write it: Crisis of biodiversity habitat.

Assume the following event and the causes and write it: Crisis of biodiversity habitat.

Assume the following event and the causes and write it: Deforestration and loss of ecosystem.

Assume the following event and the causes and writ it: Deforestration and loss of ecosystem.

Assume the following event and the causes and write it: The fertile energy of the soil is reduced and acidification of surface water.

Assume the following event and the causes and write it: Disruption of the prey-predator balance of the ecosystem of Sundarbans.

Speculate the probable causes of the following phenomena: Decrease in the concentration of dissolved oxygen in water and floating of dead fishes.

Speculate the probable causes of the following phenomena: Decrease in the concentration of dissolved oxygen in water and floating of dead fishes.

Concentrated H_(2)SO_(4) is added to each of the five test tubes containing (i) NaBr, (ii) sugar, (iii) sulphur powder, (iv) KCl and (v) copper turnings. The test tubes are then heated. Identify in which of the test tubes the following changes will be observed. The observations are: disappearance of yellow powder along with liberation of a pungent colourless gas. Support your answer with the help of a chemical equation in this case.