Final answer:
Desmoncus climbing palms and bamboo & rattan are two materials harvested in the highlands of Southeast Asia.
Step-by-step explanation:
In the highlands of Southeast Asia, two materials that are harvested are Desmoncus climbing palms and bamboo and rattan.
The Desmoncus climbing palms are used for their flexible stems and can be woven into baskets, mats, and other handicrafts. Bamboo and rattan, on the other hand, are commonly used for construction and furniture making due to their strength and durability.
therefore, Desmoncus climbing palms and bamboo & rattan are two materials harvested in the highlands of Southeast Asia.