Final answer:
Grasshoppers and frogs compete with rabbits for biotic resources in a partial food web. Grasshoppers are direct competitors as herbivores, while frogs may occasionally compete depending on their diet.
Step-by-step explanation:
The two organisms that compete with rabbits for biotic resources in a partial food web are likely to be other herbivores that consume the same food resources. Considering the options given:
Wolves - As carnivores, they would prey on rabbits rather than compete for the same food resources.
Grasshoppers - As herbivores, they eat plants and would directly compete with rabbits for these resources.
Hawks - These are predators and would not compete with rabbits for food, but may prey on them.
Frogs - Typically insectivores, some frogs may occasionally compete with rabbits if they have overlapping dietary habits that include plant materials.
Hence, the two organisms from the list that compete with rabbits for biotic resources are likely to be grasshoppers and, to a lesser extent, frogs.