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'has been extant for' is correct and can be used in written English.
You can use this expression when you want to refer to something that has existed for a certain amount of time. For example: The ancient ruins have been extant for centuries.
Exact(2)
But consider the lesser uni-table, which has been extant for 35 years and is also known as doop.
The NRFL project has been extant for two years, with Rugby Law having hosted talent combines in Minnesota and Los Angeles as it looks to create a professional league.
Similar(58)
And even "new" trucks use ancient technology that has been extant in pickups for at least 60 years.
It's only been extant for one year.
Extant research, however, has been criticized for using single survey items of unknown reliability to define adult attitudes on alcohol policy issues.
This fascinating observation suggests that the variation seen within extant human populations has been selected for in a different way to the variation that has driven vertebrate evolution.
Unlike the case for most of the last several million years, H. sapiens is the only extant hominin species and has been so for at least the last 10,000 years.
There has been a democratic system extant for 15 years, and there is no longer a restriction on mobility, but there remain high levels of poverty and temporary migration in rural areas (3).
As yet, no negative has been located for this work that has been reproduced from an extant print, and no sequence of negatives was included in the boxes that might show what happened before and after the iconic moment.
Actually, strong support has been reported for two ancient WGD events in ancestral lineages shortly before the diversification of extant seed plants (255-400 Myearsillion yeago and) and extant angiosperms (150-275 Mya), respectively [ 25].
Endogamy has been common among extant and historical aristocracies, religious groups, ethnic groups, and social classes.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com