[Answer] 5. Three of these groups of animals are mammals. Which is the odd one out?

Step 1 : Introduction to the question "5. Three of these groups of animals are mammals. Which is the odd one out?"

...1. Bats 2. Kangaroos 3. Whales 4. Frogs Mammals are a broad animal class that share a number of characteristics including having vertebrae, hair and/or fur, three middle ear bones, a neocortex in the brain, and mammary glands in females.

Step 2 : Answer to the question "5. Three of these groups of animals are mammals. Which is the odd one out?"

Frogs:

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