Which of the following would be considered a pest?

A weed that competes with crops for resources is categorized as a pest because it can adversely affect agricultural productivity by taking nutrients, water, and space that are necessary for the growth of cultivated plants. Weeds can disrupt the intended growth of crops, leading to lower yields and increased costs for farmers who may need to invest in herbicides or other forms of pest management to mitigate their impact. In the context of environmental science and agriculture, pests are typically defined as any organism that causes harm or competes with plants intended for human use, making weeds a classic example of such pests.

In contrast, helpful insects that pollinate and beneficial microorganisms in soil enhance crop growth and health, while a well-growing crop simply indicates successful agriculture rather than a pest scenario.