Why would there be many biodiversity hotspots on islands?

The hebrews originally migrated from a. india b. egypt c. arabia d. mesopotamia

Can someone me choose a broad topic and area of focus i am really doing this as a tally to see which one most people pick ok water pollution global warming endangered species atmosphere for the !

Rainbow trout is non- native to the united states. however this species is breeding with the native gula yltrout acientistrecently observed that the hola trout were becoming exitinct what is the cause of their extinction