Question

1. cities fall under the category of urban ecosystems. urban ecosystems include nature, humans, and animals in a (mostly) human - built environment. energy flow, nutrient cycles, and resource use are all necessary to maintain an urban ecosystem. most urban ecosystems are heterotrophic because they depend on materials and energy from outside their boundaries.

the significance of this reliance on outside resources is —
it demonstrates that renewable and nonrenewable resources most likely be imported into the city
it demonstrates that efficient transportation systems are the way to sustain an urban ecosystem
it demonstrates that humans are independent from nature
it demonstrates that recycling is the only way to reduce dependence on outside resources

Explanation:

Urban ecosystems are heterotrophic, relying on external materials/energy. This reliance shows they cannot produce all needed resources internally, so renewable and nonrenewable resources must be brought in from outside the city. The other options are incorrect: efficient transportation is not the only way, humans are not independent from nature, and recycling is not the only way to reduce external dependence.

Answer:

A. most likely be imported into the city