Identify the number of heterotrophs that directly depend on autotrophs for food.
6
The arrows represent which organism eats what. For example, the owl eats the rat and capybara. Similarly, if we follow the arrows from the autotrophs (present on the lowest rung), we find the organisms directly dependent on autotrophs. These include the ant, moth, caterpillar, mushroom, rat and capybara. Hence, there are 6 heterotrophs that depend on autotrophs directly for food.