<p>The title of the book is What are these body parts for?</p><p>There are important parts of our bodies, but there are parts that don't seem important.</p><p>Our ancestors balanced with their tails, but they don't have them now, but the tailbone still remains below the spine.</p><p>As humans evolved, they ate softer foods, making their jaws smaller.</p><p>So the reason we remove wisdom teeth is that there is no room for wisdom teeth to fit in.</p><p>A third eyelid, which many animals have, keeps their eyes moist and protects them from dust.</p><p>Today's third eyelid clears tears and removes dust from your eyes.</p>
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첫댓글The title of the book is What are these body parts for? There are important parts of our bodies, but there are parts that don't seem important. Our ancestors balanced with their tails, but they don't have them now; the tailbone still remains below the spine. As humans evolved, they ate softer foods, making their jaws smaller. So the reason we remove wisdom teeth is that there is no room for them to fit. A third eyelid, which many animals have, keeps their eyes moist and protects them from dust. Today's third eyelid clears tears and removes dust from our eyes.
첫댓글 The title of the book is What are these body parts for?
There are important parts of our bodies, but there are parts that don't seem important. Our ancestors balanced with their tails, but they don't have them now; the tailbone still remains below the spine. As humans evolved, they ate softer foods, making their jaws smaller. So the reason we remove wisdom teeth is that there is no room for them to fit. A third eyelid, which many animals have, keeps their eyes moist and protects them from dust. Today's third eyelid clears tears and removes dust from our eyes.