A large amount of sewage enters a river and many of the fish die. Sewage contains bacteria and organic material. Explain why the fish died.

Bacteria in the water decay organic matter in sewage -> respire aerobically -> uses the O2 in the water and reduces O2 concentration -> fish have less O2 to aerobically respirate -> fish die

Answered by Christopher H. Biology tutor

2355 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

What are two ways which the body cools itself down when too hot?


How does the body respond to a decrease or increase in core body temperature?


Describe how an impulse travels across a synapse


State the functions of five organelles in animal cells


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences