What occurs as cities expand? 

A)  increased ozone depletion 
B)  increased biodiversity 
C)  wildlife habitats degrade 
D)  more recreational opportunities

Ozone Depletion

The reduction in the concentration of ozone in the Earth's stratosphere, leading to an increased risk of sun-related skin damage and other environmental issues.

Biodiversity

The variety and variability of life forms within a given ecosystem, region, or on the entire Earth, important for maintaining ecological balance and resilience.

Wildlife Habitats

Natural environments where wildlife species live, grow, and reproduce, including forests, deserts, wetlands, and grasslands.