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Wöhler and Liebig showed that a certain group of atoms persisted unchanged through a series of important related compounds, including benzoic acid.
The fact that homeoboxes apparently operate independently of selection (since they have persisted unchanged for hundreds of millions of years) indicates that, to an important extent, form is independent of function.
Behind their reappearance lies an extraordinary story, a tale of flowers that have persisted unchanged for centuries and of the unlikely band of experts who united to rescue them from extinction.
RESULTS: The rim of FDG accumulation was seen on the first post-treatment scan obtained 1-3 mo after therapy and persisted unchanged over the 2-26 mo follow-up period.
The company, however, also noted that "challenges persisted unchanged" in the region as revenues declined by 1.4% to to €3.8 billion ($5 billion) and service revenues specifically were down by nearly 10% to $4.1 billion, as the carrier sits tight and waits for a marketing deal with Apple to kick in this year.
The 18-column species remained alive and well, living in the clear coralline seas of what is now the American Midwest, while their offshoot, with 17 columns, persisted unchanged on the muddier sea floors in New York and down through what are now the Appalachian Mountains.
Similar(43)
Condition unchanged.
Excellent, unchanged.
28%, unchanged.
She Persisted Around The World, published by Philomel Books, is available at the Guardian bookshop for £9.99 (discounted from £12.99).
That ban remains unchanged.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com