Besides pollution, other threats include overfishing, an excess of phophorus and nitrogen in the water, destruction of habitat, and motorboats. Propellers from the boats can tear out seagrass.
The main fossil evidence in support of the multiregional and candelabra hypotheses was the discovery of the Dali Man in China. ... Some genetic studies also offered support to a multiregional and candelabra models, inferring the origin of a few genetic loci outside of the African continent.
Wow. None of these are great. However, I think that A is the best answer. If you do a biodiversity study and find there is an open niche in the ecosystem, this may indicate an opportunity for an invasive species to enter the ecosystem.
