Final answer:
Human effects on biodiversity can negatively impact the availability of wild species that are necessary for breeding new crop varieties with desirable traits, thereby reducing the potential for crop improvement and food security.
Step-by-step explanation:
The genetic diversity of wild species is crucial for the development of new crop varieties with desired traits such as disease resistance, nutritional value, and drought tolerance. Wild species often contain gene variants that can be crossbred with domesticated crop varieties to add these valuable characteristics. However, human impacts on biodiversity, such as habitat destruction, pollution, and the effects of climate change, can reduce the availability of these wild species and consequently impair the potential for crop improvement. This can be further exacerbated by market forces and global agriculture trends that favor a few crop varieties over a diverse range of traditional ones, leading to a decrease in the genetic variation that is necessary for food security and agricultural resilience.