Question

1. when humans use natural resources:

earths environment changes, and impacts on living things are usually negative.
earths environment remains the same, and impacts on living things are usually positive.
earths environment remains the same, there are usually no impacts on living things.
earths environment changes, and impacts on living things are usually positive.

Explanation:

When humans use natural resources, it often leads to environmental changes. For example, deforestation (a form of natural resource use - using wood) changes the local and sometimes global environment (less oxygen production, more soil erosion). Such changes usually have negative impacts like loss of habitat for many living organisms. The other options are incorrect as human use of natural resources does change the environment (so options with "environment remains the same" are wrong) and the impacts are mostly negative (not positive in a general sense considering ecological balance disruption etc.).

Answer:

Earth’s environment changes, and impacts on living things are usually negative.