Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. These offspring will breed with each other or with birds from either parent population, and all offspring of these pairings appear intermediate to various degrees. What keeps the two populations separate?

The lionfish is a venomous fish found primarily in the red sea and the indian ocean. in the 1990s, lionfish were accidentally released into the atlantic ocean, where they found abundant resources and favorable environmental conditions. which of the following scenarios is most likely to result in the lionfish having a major impact on the communities into which they were introduced? (a) with no natural predators, the lionfish population will become very large. (b) some native species of invertebrates will develop a resistance to lionfish venom. (c) random mating will allow the lionfish population to reach hardy-weinberg equilibrium. (d) a virus that specifically infects lionfish