Final answer:
Forests east and west of Wallace's Line have different characteristic organisms due to their geographical isolation. East of Wallace's Line, some characteristic organisms include fungi, insects, reptiles, birds, rodents, and deer. West of Wallace's Line, characteristic organisms include shrubs, small trees, insects, reptiles, and birds.
Step-by-step explanation:
Forests east and west of Wallace's Line have different characteristic organisms due to their geographical isolation. Wallace's Line is an imaginary boundary between the Southeast Asian and Australasian regions. East of Wallace's Line, in Southeast Asia, some characteristic organisms of forests include fungi, insects, reptiles, birds, rodents, and deer. West of Wallace's Line, in Australasia, characteristic organisms of forests include shrubs, small trees like scrub oak and scrub pine, insects, reptiles, and birds.