The answer you're looking for is Panda because a panda has an organ system, the other choices are all microscopic organisms so they don't have an organ system
Hope this helped you out :)
Liver cells because it uses the most energy than the other choices
Answer:
Our water resources face a host of serious threats, all of which are caused primarily by human activity. They include sedimentation, pollution, climate change, deforestation, landscape changes, and urban growth.
