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Science Bowl Question

📅 NSB Round Robin 2012🎓 HS🔄 Round 4#️⃣ Question 21 TOSS UP📝 Multiple Choice

Which of the following interactions is an example of commensalism?

W) Ants living in acacia [uh-KAY-shuh] thorns, feeding on protein bodies produced by the tree and attacking herbivores that attempt to eat acacia leaves
X) Two species of barnacle occupying different tidal regions on rocky shores
Y) Ticks attaching to deer and feeding off their blood
Z) Cattle egrets following water buffalo to feed on insects scared out of grass by the buffalo
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