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Science Bowl Question

📅 NSB 2015🎓 MS🔄 Round 5A#️⃣ Question 5❓ Toss-Up📝 Multiple Choice

A keystone species is:

W) Required for maintaining the health of an ecosystem
X) Necessary for the survival of another species
Y) The last to go extinct after a disturbance
Z) The hardiest species in an ecosystem
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