Question

question 5 (1 point)
why eating sardines is generally considered more sustainable than eating tuna?
sardines are exclusively farmed, while tuna is always wild - caught.
sardines are larger predators that help control the ocean population of other fish.
only 10% of the energy of ingested food is converted into consumer biomass at each trophic level. therefore, consuming sardines, which are lower on the food chain, is more energy - efficient than eating tuna, which are higher - level predators.
sardines can only be caught using pole - and - line methods, which have zero bycatch.

Explanation:

The 10% energy transfer rule in trophic levels is key. Sardines are lower - level consumers. Tuna, being higher - level predators, require more energy (from lower - level organisms) to be produced. So, eating sardines is more energy - efficient and sustainable.
Sardines are not exclusively farmed (they can be wild - caught too), they are not larger predators (tuna are larger predators in this context), and pole - and - line methods are not the only way to catch sardines and they don't have zero bycatch.

Answer:

Only 10% of the energy of ingested food is converted into consumer biomass at each trophic level. Therefore, consuming sardines, which are lower on the food chain, is more energy - efficient than eating tuna, which are higher - level predators.