"challenging blend" is correct and usable in written English.
You can use it to describe a situation that is challenging due to a combination of many different elements. For example: "The cultural and political landscape in this region presents a complex and challenging blend of issues to navigate."
We initially challenged different blend with spontaneous contracting neonatal rat CMs to identificate the best substratum, finding that C/C 5 1 proportion can better sustain this type of culture.
But no kids would have been challenged to blend in and perform well, despite poor academic backgrounds, and with all the problems that entailed.
Barr is known for challenging assumptions while blending creativity and intellectual honesty to give voice to contemporary Jewish thought for over 30 years.
It enrolled about 300 preschool and elementary school children who were challenged by a blend of food colors and sodium benzoate in a double-blind design employing a variety of behavioral measures.
However, measuring the actual electron- and hole-transfer rates in these hybrid blends has been challenging.
There was also the issue of the couple's conflicting tastes: "I lean toward French traditional but my husband likes modern, so it's a challenge to blend our styles," she wrote.
On her reading list is Amina's Voice, a middle schoolers' book about a Pakistani American Muslim girl's challenge to blend in while staying true to her family's culture, by Hena Khan, and a post-apocalyptic saga, The Boy on the Bridge, for adult readers.
But observers say it will be a challenge to blend the operating styles of the two agencies, which now have very different cultures.
But women with young children face additional challenges to blend their work and home lives successfully.
Summitt kept challenging her: stand out, don't blend in.
