The xylem is made from dead, hollow cells.
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Tracheids and vessel elements are the main components of xylem witch have a function to transport water. Those are elongated dead cells at maturity (without protoplast) with a thick, strengthened cellulose cell wall and a hollow lumen. Even though they are dead they still maintain a function, because are being protected by surrounding living cells.</span>
Flowers that bloom in different months
The correct answer is the BIG BANG explosion occurs approximately 545 million years ago
Silurian Period which was formed hundreds of millions of years ago