A pest is considered anything that...

A pest is defined as any organism that causes harm or damage to humans, animals, crops, structures, or possessions. This definition encompasses a wide range of entities, including insects, weeds, and certain animals that negatively impact agricultural productivity, human health, and property. The impact of pests can vary from causing minor inconveniences to significant economic losses or health risks.

The other options highlight characteristics that are contrary to the definition of a pest. For instance, organisms that support the growth of crops or are beneficial to the environment perform positive roles, not negative ones. Additionally, the idea of being natural and non-invasive does not align with the typical definition of pests, which often includes invasive species that disrupt ecosystems or agricultural practices. Thus, the concept of pests centers on their harmful effects, making the choice centered around injury or damage the most accurate.