Think about, say, caterpillars. How many caterpillars out of a clutch of eggs manage to hatch, eat enough to pupate and become adult butterflies and moths? It's a pretty rough life, most are eaten!
But if an ant gets to the larval stage she's probably going to be fine. She's safe, surrounded by abundant food. She doesn't even need to walk when she's a larvae to find her food. She even gets help emerging from her cocoon.
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