Question

at which level do the organisms all carry on both respiration and photosynthesis? the diagram below represents an energy pyramid. diagram of a pyramid with levels a (top), b, c, d (bottom). below the diagram: options a, b, c, d each with a circle.

Explanation:

In an energy pyramid, the bottom level (level D) consists of producers (usually plants or autotrophs). Producers perform photosynthesis to make their own food and also carry out respiration to release energy from the food. Levels above (A, B, C) are consumers (herbivores, carnivores, etc.) that do respiration but not photosynthesis (as they can't produce their own food via photosynthesis). So only level D organisms (producers) do both respiration and photosynthesis.

Answer:

D