Final answer:
If all the grass disappeared from this community, the most likely change would be a decrease in the squirrel population.
Step-by-step explanation:
The most likely change to occur if all the grass disappeared from the community would be that the squirrel population would decrease. This is because squirrels rely on grass as a source of food, specifically the seeds that grass produces. Without grass, the squirrels will have a decreased food source, leading to a decline in their population.
The decreased squirrel population will also have a cascading effect on the ecosystem. For example, if squirrels are a major prey species for predators like hawks or foxes, their decline could impact the predator populations as well.
Overall, the disappearance of grass would disrupt the food chain and have a negative impact on the squirrel population and potentially other species in the community.