Question

Why are some species native to the Ganges River, such as the Ganges river dolphin, becoming endangered?

The river frequently floods.


The river is heavily polluted.


The river contains many invasive species.


The river is suffering from saltwater intrusion.

Answer 1

Correct choices: The river is heavily polluted; the river contains many invasive species; the river is suffering from saltwater intrusion.

Explanation: Frequent flooding is a natural part of the Ganges system and not a primary cause of endangerment for species adapted to flood pulses. By contrast pollution (industrial effluent, sewage, agricultural runoff), invasive species that alter food webs, and saltwater intrusion (reduced freshwater flow + sea‑level rise causing salinity changes) all degrade habitat and food resources. In addition, major threats not listed above that have driven Ganges river dolphins toward endangerment include dams/barrages and water extraction (habitat fragmentation and reduced flows), bycatch in fishing gear, boat traffic and noise, and sand mining.