Question

3 multiple choice 20 points
why is it harmful to introduce non - native species to an environment?
they clean up pollution.
they can disrupt the balance and harm native species.
they do not survive in the new environment.
they always help native plants grow.
4 multiple choice 20 points
how can people reduce the consumption of natural resources?
recycle materials and use renewable resources.
cut down more trees.
use more water and electricity.
throw away old materials.

Explanation:

For question 3: Non - native species can disrupt the ecological balance. They may out - compete native species for resources (like food, water, and space), predate on native species, or introduce new diseases. Cleaning up pollution is a positive impact (not harmful), and non - native species often can survive in new environments (either by naturalization or becoming invasive). Also, they do not always help native plants grow.
For question 4: Recycling materials reduces the need to extract new raw materials from natural resources. Using renewable resources (like solar or wind energy instead of fossil fuels) also conserves non - renewable natural resources. Cutting down more trees, using more water and electricity, and throwing away old materials all increase the consumption of natural resources.

Answer:

1. They can disrupt the balance and harm native species.
2. Recycle materials and use renewable resources.