The carbon atom is sometimes listed as carbon-12 and sometimes as carbon-14 what does this mean? plz this is urgent

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

my teacher would say no s