Final answer:
Efforts to combat malaria can have unintended negative consequences, such as reducing food for wildlife, decreasing the availability of clean water, and causing birth defects.
Step-by-step explanation:
An effort to combat malaria can further damage people's health in several ways. One way is by reducing the number of mosquitoes, which reduces the amount of food for birds and other wildlife (Option 1). Another way is by moving settlements away from wetland areas infested with mosquitoes, which reduces the amount of clean water available (Option 2). Additionally, antibiotics used to treat malaria can cause birth defects (Option 3). Draining wetlands to decrease the number of mosquitoes can also reduce the amount of clean groundwater available (Option 4).