Yeah, certain fruit trees don't get pollinated unless there are honey bees around. Oddly enough people didn't know that when they started planting fruit trees in America that were not native to the country but because they also brought over the European honeybee to make honey it worked out OK anyway.
Sadly yellowjackets were also brought to the New World and whether it was by accident or intentional the only ecological niche they fill is the torment humans and kill monarch butterfly caterpillar niche, at least the larvae of mosquitoes provide good nutrition for small fish but nothing eats yellowjackets and yellowjackets don't pollenate anything since they are carnivorous.
Zombies do not eat the flesh or brains of humans, they harvest sugar cane and are under the control of the sorcerer who created them, it is the ghouls who mindlessly rob graves of the dead and kill humans for eating purposes. Night of the Living Dead is a ghoul movie.
I know this is useless but I hate to see hard working zombies getting constantly maligned in this way and decided to put my two cents worth in here even if it isn't worth much.