Why do we use base our currency on gold instead of something like silicon or iron?

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls

when it is at an intermediate population density