Explain how the ecosystem that you selected follows the law of conservation of mass and the law of conservation of energy. it is said that only about 10% of stored energy is transferred between trophic levels of the ecosystem. be specific in using your ecosystem in your example.
im doing it on the ocean

In the ocean, light is used by phytoplankton in order to produce sugar.  10% of the energy from the sun is available to the zooplankton that eat the phytoplankton, the rest of the energy is lost as heat or through powering body building/functions/reproduction.  Whatever eats the zooplankton receives 10% of that energy in order to grow