Your response is clear and effectively addresses the prompt regarding the ecosystem's response to the disappearance of bison. However, there are some grammatical issues and areas where clarity can be improved. Here’s a revised version that keeps your original ideas intact while correcting errors and enhancing clarity:
When the bison disappear, the elk population will expand since they will have no bison to compete with for food. This will lead to overgrazing. The wolf population will also increase because they will have more food to hunt. If the elk overgraze too much, the plants will also disappear, leading to a decline in the elk population. This, in turn, will cause the wolf population to decline because they will not have enough food to sustain themselves and may ultimately die.
This scenario relates to biodiversity since diverse species are necessary for an ecosystem to thrive. Multiple animals contribute to competition, which allows the ecosystem to maintain a steady amount of resources. Resilience is also relevant because, after the initial decline, the plants in the ecosystem have the potential to grow back, enabling the elk and bison populations to recover again.
These corrections improve the flow of your writing and ensure that the relationships between biodiversity, resilience, and ecosystem dynamics are clearly articulated.