B. They decrease. As more we use the sources of nature, the less is left.
Be there for them and let them know they're not alone.
Living things in the environment such as plants, animals, and bacteria are biotic factors. Biotic factors also include once-living parts such as dead leaves on the forest floor. Abiotic factors are nonliving aspects of the environment such as sunlight, temperature and water. One important abiotic factor is soil.
D. All of the above are true.
