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Autotrophs are organisms that are able to produce their own food (plants and some protoctists)

They can also be called producers

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They contain chloroplasts, which contain a pigment called chlorophyll. Chlorophyll absorbs red and blue sunlight (emits green) via photosynthesis.

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These plants and/or protoctists containing chloroplasts are able to perform photosynthesis. Meaning they will produce their own sugar to feed themselves.

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They are organisms that feed on other organisms which are living or that have been recently killed

They can also be called consumers

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1° consumers ➡ feed directly on autotrophs/producers (Herbivores)

2° consumers  ➡ feed on 1° consumers (Carnivores)

3° consumers ➡ feed on 2° consumers (Carnivores)

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Herbivores: Feed on plants only

Carnivores: Feed on meat/flesh only

Omnivores: Feed on plants and meat

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They are organisms that feed on dead organic matter and decompose it

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They are decomposers that feed on dead organic matter and digest it internally (They usually have a gut)
Example: Larvae of dung beetles

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They are decomposers that feed on dead organic matter and digest it externally (They usually don't have a gut)
Example: Mucor (fungi)

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They release digestive enzymes onto the dead organic matter and then absorb the products of the digestion

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Energy is in the form of ATP (Adenosine triphosphate, C₁₀H₁₆N₅O₁₃P₃). ATP can be used readily by cells and organisms.

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Only 10% of the energy contained within a trophic level is transferred onto the next level. 90% is "lost".

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There are four reasons that contribute to the 90% loss of energy from one trophic level to the next

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1. The organism died before being consumed

2. Use it for themselves (cellular respiration). Organic organisms use a lot of their energy for functions of life.

3. Not all parts of an organism are consumed by the other organism that feeds on the 1st one.

4. Not all parts are digested.