Energy is passed from one organism. To another in a linear sequence we call it a

Tropic level

Pyramid of biomass

Food chain

Pyramid of numbers

The linear sequence that passes energy from one organism to another is called the food chain. The energy is transferred starting from the Sun which is necessary for the plant's photosynthesis then move towards animals consuming plants as food. This is usually followed by humans eating animals like pigs and chickens for food.