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Fossils from the World’s Oldest Trees Reveal Complex Anatomy Never Seen Before

The first trees to have ever grown on Earth were also the most complex, new research has revealed.

Fossils from a 374-million-year-old tree found in north-west China have revealed an interconnected web of woody strands within the trunk of the tree that is much more intricate than that of the trees we see around us today.

The strands, known as xylem, are responsible for conducting water from a tree’s roots to its branches and leaves. In the most familiar trees the xylem forms a single cylinder to which new growth is added in rings year by year just under the bark. In other trees, notably palms, xylem is formed in strands embedded in softer tissues throughout the trunk.

Writing in the journal Proceedings of the National Academy of Sciences, the scientists have shown that the earliest trees, belonging to a group known as the cladoxlopsids, had their xylem dispersed in strands in the outer 5 cm of the tree trunk only, whilst the middle of the trunk was completely hollow.

The narrow strands were arranged in an organised fashion and were interconnected to each other like a finely tuned network of water pipes.

Rather than the tree laying down one growth ring under the bark every year, each of the hundreds of individual strands were growing their own rings, like a large collection of mini trees.

As the strands got bigger, and the volume of soft tissues between the strands increased, the diameter of the tree trunk expanded. The new discovery shows conclusively that the connections between each of the strands would split apart in a curiously controlled and self-repairing way to accommodate the growth.

At the very bottom of the tree there was also a peculiar mechanism at play — as the tree’s diameter expanded the woody strands rolled out from the side of the trunk at the base of the tree, forming the characteristic flat base and bulbous shape synonymous with the cladoxylopsids.

Co-author of the study Dr Chris Berry, from Cardiff University’s School of Earth and Ocean Sciences, said: “There is no other tree that I know of in the history of Earth that has ever done anything as complicated as this. The tree simultaneously ripped its skeleton apart and collapsed under its own weight while staying alive and growing upwards and outwards to become the dominant plant of its day.

“By studying these extremely rare fossils, we’ve gained an unprecedented insight into the anatomy of our earliest trees and the complex growth mechanisms that they employed.

“This raises a provoking question: why are the very oldest trees the most complicated?”

https://www.sciencedaily.com/releases/2017/10/171023182615.htm

[TBC: Evolution has declared that simple forms grow more complex, but as Answers in Genesis points out, “There is no question that molecular machines are remarkable devices, with independent modules capable of protein substrate recognition, unfolding, threading, and translocation through membranes.” The evidence is clear, as Romans 1:20 states, that the Creator God can be known through His creation. Many people will stand in awe of the complexities of molecular machines and still deny they are the result of God’s handiwork. But that doesn’t change the truth of His Word that He is the Creator of all things” (https://answersingenesis.org/intelligent-design/the-end-of-irreducible-complexity/).]

 

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