Explanation:

1. The answer to the riddle "What peels like an onion but still remains whole?" is a snake. Snakes shed their skin, which can resemble the peeling of an onion.

2. The mammal that can't jump is the elephant. Despite their size and strength, elephants are not able to jump off the ground.

3. The animal that can turn its head around 270 degrees and is known for being quiet in flight is an owl. Owls have the ability to rotate their heads to a large extent, and their wings are designed to fly silently, allowing them to hunt effectively at night.

The correct answers shall be:

1. A snake

• In spite of being peelable like an onion, it remains whole. The snake remains whole even though its skin peels off as it sheds like an onion.

2. Elephants

• Elephants are the only mammals that can't jump. They have difficulty lifting their feet off the ground simultaneously due to their size and weight.

3. An owl

• It is a bird that is able to turn its head around 270 degrees and is noted for being quiet in flight. Owls have a unique ability to rotate their necks almost all the way around, which allows them to see in all directions without having to move their body. They are also able to fly silently due to the structure of their feathers, which helps them to hunt more effectively.

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