Sentences with phrase «little direct evidence exists»
But little direct evidence exists to prove which tree species filled the forests before they were cleared for fields and fuel.
https://www.scientificamerican.com/ Not exact matches
By tweaking their approach just a little, astronomers have now turned up the first direct evidence that they do in fact exist.
However, while such role - model effects are widely believed to be important, there is actually little direct empirical evidence that they exist.