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The correct answer is larva. A larva is the immature, free-living form of many invertebrates, amphibians, and fish that undergoes significant transformation before becoming an adult. This stage is crucial for growth and development, often featuring different morphology, habitat preferences, and dietary requirements compared to the adult form.

In the life cycles of these organisms, larvae often serve various ecological roles, allowing them to exploit different resources and environments than their mature counterparts. The transformation that occurs from larva to adult is part of a process called metamorphosis in many species, particularly in amphibians like frogs.

The other terms provided do not pertain to developmental stages in biological contexts. Thus, they are not related to the concept of an immature form that significantly differs from its parent at hatching.