The correct options are:
B- drastically increased the population after settling on the island
C- exhausted energy sources provided by the local ecosystem
D- devoted labor and nonrenewable volcanic rock to construct moai
E- planted crops that were not native to the island
The practices that contributed to the Rapa Nui society's lack of sustainability include:
B- Drastically increased the population after settling on the island: The Rapa Nui people, upon settling on Easter Island, experienced a rapid population growth. The increased demand for resources, such as food and shelter, strained the island's ecosystems, leading to environmental degradation.
C- Exhausted energy sources provided by the local ecosystem: The Rapa Nui society heavily relied on the island's natural resources for fuel and construction materials. Over time, this overexploitation led to deforestation and depletion of essential resources, undermining the sustainability of their way of life.
D- Devoted labor and nonrenewable volcanic rock to construct moai: The construction of the iconic moai statues required significant amounts of labor and resources, particularly the nonrenewable volcanic rock. This extensive use of finite materials further contributed to the environmental degradation and unsustainability of their society.
E- Planted crops that were not native to the island: Introducing non-native crops strained the island's ecosystem, as these plants may have competed with indigenous species for resources. This disruption to the natural balance of the environment undermined the sustainability of agricultural practices on the island.
In summary, the practices that led to the Rapa Nui society's lack of sustainability were the drastic population increase, exhaustion of local energy sources, devotion of resources to moai construction, and the introduction of non-native crops.