Zach is making cookies but he does not have enough brown sugar to make up for a recipe for a recipe calls for 2/3 cup of brown sugar if zack has enough brown sugar for 3/5 of the full recipe how much brown sugar does he have?

The people of Finland, who are secluded to some degree from the rest of the world by water, develop certain diseases due to the lack of genetic material from other ethnicities and races.
Physical barriers prevent fish from one stream from mating with fish from another stream, leading to a less varied gene pool among those fish. As time passes, the fish become unable to successfully mate with other groups.
A mountain range prevents two types of goat from mating, causing the gene pool to become less varied.