The presence of ______ for swimming in a tad-pole enables it to adapt in an aquatic habitat.

Analyze the question: A tadpole is the larval stage of a frog. The question asks which structure is used for swimming and so helps it live in water.

Explain the concept: Tadpoles are adapted to aquatic life in several ways:

• Gills are for breathing (respiration), not swimming.
• A swim bladder is found in bony fishes and controls buoyancy. Tadpoles do not have one.
• A tail is a muscular, flattened structure. It moves from side to side and pushes the tadpole through the water. It is lost during metamorphosis, when the tadpole becomes an adult frog.
• Fins are the swimming organs of fish. A tadpole has no true paired fins, only a tail with a thin fin-like membrane along it.

Solution:

1. The question asks about swimming, so we can eliminate gills (breathing).
2. A swim bladder is for buoyancy and is not present in tadpoles.
3. Fins belong to fish. A tadpole does not have true fins.
4. The tail is the organ a tadpole actually uses to swim.

Answer: The correct option is **C.

Tip: Link each organ to its function. Tadpole: tail → swimming, gills → breathing. Fish: fins → swimming, swim bladder → buoyancy. When a question mentions a tadpole, think "tail", because it is lost when the tadpole becomes a frog.