Like most other small islands in oceania, the hawaiian islands are also vulnerable to rising sea levels.

a. brown tree snakes, an invasive species, are a problem throughout the region.
b. almost all countries in the region are either prone to sea level rise and/or coastal pollution.
c. deforestation is a common problem among the small island countries in oceania.
d. only one country in the region has both desertification and deforestation.

b. Almost all countries in the region are either prone to sea level rise and/or coastal pollution

Explanation:

The Oceania is largely considered as part of the pacific ocean and it comprises of the island group of the Polynesia, Micronesia, Melanesia, and all are well known volcanic islands. These have coral reefs and coral platforms and most of these islands have no or low tree have a narrow belt of grasslands and owning to forest and fishing industry like the sandalwood industry of Hawaii. Land subsidence and the vulnerability to the floods due to the rising sea level is common for these small islands.

Tropical climate is experienced in the nothern countries of south america

None of them. they are likely to occur on any plate boundary