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Explanation: ... Evaluation of global ocean biomass and primary production It is very difficult to detect long-term trends of ocean biomass since it varies widely over a short ...
It was a difficult choice because all the answers are correct, but I had to choose, and I had to decide for yours to grade the answer fully with 4 points because of your support and source that you provide. That takes diligent time and much effort, and I thank you for that. Also, thanks to all the rest for your contributions. Thank you all very much. 4 KudoZ points were awarded for this answer