Approximately what percentage of energy transfers to the next food chain level?

10%

90%

73%

50%

Aswell as,

Which of the following is always at the base of a food web?

Herbivores

Detritivores

Producers

Consumers

1) Only 10% of energy is transferred from one food chain level to the next.

This is called the 10% rule of ecological efficiency. Some of that energy is lost as heat or through energy reactions within the organism.

2) Producers are found at the base of the food chain.

Producers are autotrophs and can create their own food using sunlight, meaning they receive energy directly from the energy source of all food chains, the sun, and they are consumed by other organisms.