Select the way that humans can negatively affect aquifers. a. Humans build roads, which prevents rainwater from replenishing aquifers.
b. Humans build sea walls, which prevents seawater from entering aquifers.
c. Humans line and seal wells to prevent pollutants from entering an aquifer.
d. Humans prefer to use lake water as a source for drinking water rather than aquifers.

a. Humans build roads, which prevents rainwater from replenishing aquifers.

Explanation:

This is because an aquifer is a body of rock that holds water or ground water and can readily transmit this water to Wells and springs. But human activities like building of roads has affected this. During road construction, rocks are broken down and ground water are depleted, as the roads are built, rain water will not be able to sink down to the ground rather will be on the tilled road which prevent it from getting to aquifer.

land

explanation:

australia is the flattest continent, and it has vast plains.