Cowbirds have a parasitic relationship with other bird species. which change in a limiting factor would decrease the carrying capacity for wood thrushes and the mid story of a mixed oak forest?

Sorry i don’t know what to do

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.