Question

Why is each level of the energy pyramid smaller than the level directly below it?
(1 point)

Because 90% of the energy is passed on to the next level to be used by the
organisms there.

Because 10% of the energy at each level moves to the next level and some
additional energy is converted to heat.

Because the sizes of each level show that 10% is consumed by organisms at
that level.

Because about 10% of the energy is converted to heat when organisms become
ill and another 10% when they die.

Answer 1

Because 10% of the energy at each level moves to the next level and some additional energy is converted to heat. This is the 10% rule: most energy is lost to metabolism, heat, and waste, so only about 10% is available to the next trophic level.