At each level of the food chain, what happens to approximately 90% of the available energy?

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Coral have a symbiotic relationship with what in order to eat?