[Answer] 10. The ribs and vertebrae of turtles and tortoises have evolved into which of these?

Step 1 : Introduction to the question "10. The ribs and vertebrae of turtles and tortoises have evolved into which of these?"

...1. Tall spines 2. A thicker braincase 3. A large fan or sail 4. The shell Of course, the answer is a turtle's first defense, its shell.

Step 2 : Answer to the question "10. The ribs and vertebrae of turtles and tortoises have evolved into which of these?"

The shell:

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