If only 10% of the energy from one trophic level passes up to the next level, what happens to the 90% energy that is not passed on?

It is lost as heat.

Explanation:

As energy is transferred from one trophic level to the next, energy involved in metabolic processing(breaking of chemical bonds) is converted into heat energy.  

meiosis is the correct answer

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.