How is energy stored and transferred among organisms in an ecosystem?

I’m going to assume based on your question that the correct answer would be through consumption. The phrasing of the question is a little weird. Basically, think of the food chain. Very bottom you have plants which absorb energy from the sun through photosynthesis. Then said plant gets eaten by an animal. However only 10% of energy is gained when something is consumed.
At each tropic level 90% of the energy that would be gained is lost. Energy can be stored in vacuoles and fat depending on the organism.

The answer is option a.

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass