Catalan has inherited the typical vowel system of Vulgar Latin, with seven stressed phonemes: /a e i o u/, a common feature in Western Romance, except Spanish. Balearic has also instances of stressed //. Dialects differ in the different degrees of vowel reduction, and the incidence of the pair / e/.
Where is this a common feature?
Western Romance

Today the word szlachta in the Polish language simply translates to "nobility". In its broadest meaning, it can also denote some non-hereditary honorary knighthoods granted today by some European monarchs. Occasionally, 19th-century non-noble landowners were referred to as szlachta by courtesy or error, when they owned manorial estates though they were not noble by birth. In the narrow sense, szlachta denotes the old-Commonwealth nobility.
What were the non noble land owners referred too as?
szlachta

Chapter VIII addresses the idea that species had special characteristics that prevented hybrids from being fertile in order to preserve separately created species. Darwin said that, far from being constant, the difficulty in producing hybrids of related species, and the viability and fertility of the hybrids, varied greatly, especially among plants. Sometimes what were widely considered to be separate species produced fertile hybrid offspring freely, and in other cases what were considered to be mere varieties of the same species could only be crossed with difficulty. Darwin concluded: "Finally, then, the facts briefly given in this chapter do not seem to me opposed to, but even rather to support the view, that there is no fundamental distinction between species and varieties."
What are Darwin's thoughts on producing hybrids of related species?
the viability and fertility of the hybrids, varied greatly, especially among plants