The best answer to the question above would be letter D. The inhabitants near Lake Baikal in Russia had protested about its pollution and forced some of the worst offenders to close. This is because they are afraid that the Lake might be a threat to their lives because it affects their lives directly when it is not properly conserved.
D.
When one population cannot interbreed with the other population. FUN FACT! There's an exception. If a Lion has sex with a Tiger, a rare unfertile species called a 'Liger' is produced.
