Which plants parts do siamangs rely on most as a source of their matter and energy?

Siamangs primarily rely on fruits as their main source of matter and energy, as they are frugivorous primates. They consume a variety of fruits, including figs, which are abundant in their forest habitats. Additionally, they may eat leaves, flowers, and occasionally insects, but fruits make up the bulk of their diet, providing essential nutrients and calories for their active lifestyle.