After getting on the boat, he went to wipe the sea water on his body. As soon as he changed his clothes, he heard Professor Yin's voice sounding on the boat: "Xiao Ao, Xiao Ao, where are you?"

Lu Wuyi's big voice sounded: "Professor, if you have something to do, you can tell me the same."

"Is the same? I want to ask Xiao Ao something, it's very important."

"That's definitely the same. What are you asking? I know everything my brother-in-law knows."

"Where did this sea turtle fossil come from?"

"It's in the sea."

"I know the sea, I mean, that location? What else is around?"

"This genius knows." Ao Muyang walked out of the cabin and saw Lu Wuyi spread his hands out of helplessness.

He slapped Lu Wuyi in the head and said dissatisfiedly: "Get out."

"Okay, brother-in-law." Lu Wuyi responded happily.

After seeing him, Professor Yin was very happy and pulled his arm and asked, "Xiao Ao, Xiao Dou and Xiao Song said that you caught this fossil from the sea?"

Ao Muyang recalled roughly, pointed to the direction in front and said, "Yes, it was caught from there. I saw it under the water as a fossil of a turtle. I thought it might be useful, so I caught it..."

"Your feeling is so accurate, it's just useful!" Professor Yin slapped his thighs excitedly.

Ao Muyang was happy and asked, "That's great, what's the use?"

Professor Yin said: "What I can say now is not very accurate, because what I see is a broken fossil, but I can also tell you a little bit. First of all, you know that whether it is tortoise or sea turtle, the function of the turtle shell is used to protect the body, right?"

Ao Muyang nodded: "Yes."

Lu Wuyi said not far away: "I know this. When a turtle encounters danger, it will shrink into its hard shell. This is called shrinking the turtle into its body. It is a defensive technique in martial arts."

"Don't mess around, get out of here."

"I haven't made trouble, brother-in-law, I want to study, and I want to make progress," Lu Wuyi said aggrievedly.

Professor Yin waved his hand and said, "Xiao Ao, don't treat Xiaolu with such a bad attitude."

He felt good about Lu Wuyi, so he specifically said to him: "What you said is wrong. The tortoise has the habit of retracting its limbs and head back into its shell, which the turtle cannot do."

"That's right." Lu Wuyi looked suddenly.

Professor Yin continued to say to Ao Muyang: "In fact, there is a speculation in the reptile community that the turtle shells evolved from primitive turtles were not used to accommodate the body to avoid natural enemies. Because in the era 200 million to 300 million years ago, there were a large number of large fish and animals in the ocean and on land. One of the common characteristics of these big guys is that their biting power is strong. The turtle shells can block the attacks of most fish and animals in today's world, but at that time it could not block those terrifying predators."

"So, guess what was the tortoise shell used for in the beginning?"

"Since it's not for defense, it's for attack?" Lu Wuji guessed.

Ao Muyang was confused. How to use this turtle shell to attack? When the turtle found the opponent, he jumped up and then smashed them with the turtle shell.

"It's not for attack or defense. You continue to guess what they have evolved into the turtle shell for?" Professor Yin said with a smile, "Tip, the turtle shell is indeed used to save lives."

"You can't attack or defend, that's it to attack support? Can they recover blood? Can they treat similar people? Can they hide themselves?" Lu Wuyi worked in several similar people in a row.

Ao Muyang reached out and wanted to suck him again. This guy didn't feel uncomfortable.

As a result, when he heard his last sentence, the old professor slapped his thigh and said excitedly: "I guessed it right!"

Lu Wuyi was confused: "Who is right?"

The old professor patted his shoulder and said, "Good boy, I knew you were smart and really lived up to my expectations."

Lu Wuyi quickly raised his head and looked confident, as if he had just overcome some world problems.

Ao Muyang was too lazy to pay attention to him and asked Professor Yin: "What is this turtle shell used for?"

Professor Yin said with a smile: "Didn't the deer say it? It is used to hide itself, and the ancient turtle uses it to dig a hole to hide it."

"Yes, it's used to hide yourself." Lu Wuyi nodded decently, as if he knew it very well.

Ao Muyang was drunk.

Professor Yin didn't say more to him, and he urged: "Xiao Ao, can you go to the sea again and look for other fossils? This thing is very precious. We will return to Professor Li immediately after we find it. He is the expert."

Ao Muyang said: "Okay, then I'll bring the tools. The other fossils are embedded in the seabed granite. It's not easy to remove them."

"If you find a way to get the whole stone out, don't try to dig out the fossils. That depends on professional talents and professional tools." Professor Yin quickly reminded.

Ao Muyang nodded and said, "I know this."

He found tools such as hammers, crowbars and harpoons on the boat, and then brought two doctoral students with good diving skills to the sea.

The location of the fossil was not far from the scientific research ship, and the sea water was not deep, less than thirty meters.

After they dived, Ao Muyang found the fossil and took the two of them to pry the stones.

In addition to the complete fossil that he found at first, he searched again behind him. Before the sun set, he found two turtle fossils again, but they were all incomplete.

Professor Yin was very excited to see these three fossils, especially the complete fossil. He didn't even eat supper, and immediately took a magnifying glass and an album to study it.

Lu Wuyi was very happy that the scientific research boat returned early.

Ao Muyang went to call Professor Yin for dinner, and the old man shook his head: "You eat first, wait until I return to the village and ask Lao Li to treat me. He must treat me a big meal."

"So have you found anything?"

Professor Yin smiled and said, "Yes, first of all, I read it right. What you happened to encounter was indeed the fossil of the original turtle, the ancestor of modern turtles. Do you know the original turtle?"

Ao Muyang shook his head: "I heard it for the first time."

Professor Yin said: "Well, let me briefly introduce it to you. The original turtle is the ancestor of modern turtles, but it looks a little different from modern turtles. The upper ventral turtle shells have been completely formed on their body, but there are only half of the carapace on the back and there are teeth in the mouth. They lived about 250 to 60 million years ago."

Ao Muyang asked: "The original turtle's shell was only half at first, because it was not necessary to dig a cave, right?"

Professor Yin nodded: "It should be so, but evolution is a very complicated process. We need rigorous research and sufficient evidence to draw conclusions."

"The fossils we found are very important. Their turtle shells are larger than the original turtle fossils found in the past, and the sharp curves are also gentle. What does this mean? We are likely to discover the bridge between the original turtle and modern turtle. This is not only helpful for reptile research, but also important for the entire evolutionary chemistry!"

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