Sentence examples for difficult to established from inspiring English sources

It could be due to the fact that GC-rich genes evolve more rapidly than GC-poor ones (Romiguier et al. 2013), hence for which orthology is more difficult to established, or that duplicated genes (excluded from our analyses) tend to exhibit higher GC content because of gene conversion (Galtier 2003; Benovoy et al. 2005).

Causality is always difficult to establish.

The truth of this is somewhat difficult to establish.

Coöperation is difficult to establish and almost as difficult to sustain.

But who provided what to whom, this is very difficult to establish".

But they have found it difficult to establish the magnitude of the aerosol cooling.

Facts matter – including the fact that in this case the relevant facts are difficult to establish.

It is difficult to establish an adequate system of law in China and requires more effort".

Beneath all the controversy, it is not difficult to establish basic truths about Kaminski's past.

Beyond that, he said, it was difficult to establish what had happened.

Even the military admits that the truth can be difficult to establish.