How much phytoplankton is needed for one dolphin weighing 400 kg to exist normally in the Black Sea?

1) compose a food chain: phytoplankton -> zooplankton – “non-predatory fish -> predatory fish -> dolphin;
2) using the rule of the ecological pyramid (when moving from one link in the food chain to another, energy losses are 90% and only 10% of the energy is stored by the body), we calculate the biomass of the links in the food chain;
3) phytoplankton need 4,000,000 kg.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.