Why I said "certain bacteria" They digest our food, after all. The rest? We could live without them.
Fish are necessary for algae? Explain. Algae pre-date fish by two Billion years.
Fish are unnecessary for human survival and complicate the model too much[what fish? Now we need prey species vs feeding them ourselves]. Chickens I will allow.
Would it really matter to us if all non photosynthesizing life on earth besides humans, pigs, cows and certain bacteria went extinct? Not saying that should be policy, but I can not think of a reason the human race could not carry on.
This came out the year I graduated from West Seneca West [1974] I got my diploma and ROASTED the tires on my 289 67 Mustang in the parking lot with this song blaring on the radio.