Groundwater can be used by leaking septic systems

The answer is pollution.

Groundwater is water under the surface of the Earth which is widely used as a source of freshwater. Thanks to its position, it is not as much vulnerable to pollution such as surface water. However, some leaking of landfills, septic systems and agricultural chemicals that can reach it deep down under the surface can cause groundwater pollution.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.