Describe ​2​ ways that removing a single organism from a food chain can impact the entire ecosystem.

when an organism is removed, the other organism who eats or hunts them will decrease some because they lost one of the food sources, even though they still have other food sources. this new organism will break the balance of the ecosystem so their food sources will decrease by having too many predators that hunt and eat them.

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The extinction of one organism can cause a ripple effect that impacts all of the species involved in that food web. The extinction of a keystone species might force all of the connected organisms to adapt, and another species to rise up and take it's empty place in the food web, or the whole food chain might also die out, because this species is one whose presence and activities strongly affected the other species. The extinction of species with a strong interaction in the food web occur more often than the extinction of the ones that do not have much interaction.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.