Caitlyn's reading teacher is explaining that, in words, a "long e" sounds like "eee" and a "short e" sounds like "eh." What concept is her teacher describing

The answer is "phonemes".

Explanation:

The phoneme seems to be a speech production entity, that has no sense by itself, although they are capable of writing phrases whenever they bring consonants combined.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

answer; i believe the answer is 80%, plz check first good luck;