Egestion is the discharge or expulsion of undigested material (food) from a cell while excretion is process of eliminating or expelling waste matter (that had already been digested)
Each of the 3 type of finch consume different food sources. if two of the food sources are gone, the other two finch’s won’t be able to eat and survive. the entire population of these 2 types may become extinct; only the last specie will survive.
in conclusion, the finch population will decrease.
hope this helps!
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