In late 1954, Gen. J. Lawton Collins was made ambassador to "Free Vietnam" (the term South Vietnam came into use in 1955), effectively elevating the country to sovereign status. Collins' instructions were to support the leader Ngo Dinh Diem in subverting communism, by helping him to build an army and wage a military campaign. In February 1955, Eisenhower dispatched the first American soldiers to Vietnam as military advisors to Diem's army. After Diem announced the formation of the Republic of Vietnam (RVN, commonly known as South Vietnam) in October, Eisenhower immediately recognized the new state and offered military, economic, and technical assistance.
Along with Free Vietnam, what was another term for South Vietnam?
Republic of Vietnam

The other usage refers to a language that is socially subordinated to a regional or national standard language, often historically cognate or related to the standard language, but not actually derived from it. In this sense, unlike in the first usage, the standard language would not itself be considered a "dialect," as it is the dominant language in a particular state or region, whether in terms of social or political status, official status, predominance or prevalence, or all of the above. Meanwhile, the "dialects" subordinate to the standard language are generally not variations on the standard language but rather separate (but often related) languages in and of themselves. For example, most of the various regional Romance languages of Italy, often colloquially referred to as Italian "dialects," are, in fact, not actually derived from modern standard Italian, but rather evolved from Vulgar Latin separately and individually from one another and independently of standard Italian, long prior to the diffusion of a national standardized language throughout what is now Italy. These various Latin-derived regional languages are therefore, in a linguistic sense, not truly "dialects" of the standard Italian language, but are instead better defined as their own separate languages. Conversely, with the spread of standard Italian throughout Italy in the 20th century, various regional versions or varieties of standard Italian developed, generally as a mix of the national standard Italian with local regional languages and local accents. These variations on standard Italian, known as regional Italian, would more appropriately be called "dialects" in accordance with the first linguistic definition of "dialect," as they are in fact derived partially or mostly from standard Italian.
What are 20th century variations on standard Italian called?
regional Italian

The elimination of wolves from Yellowstone National Park had profound impacts on the trophic pyramid. Without predation, herbivores began to over-graze many woody browse species, affecting the area's plant populations. In addition, wolves often kept animals from grazing in riparian areas, which protected beavers from having their food sources encroached upon. The removal of wolves had a direct effect on beaver populations, as their habitat became territory for grazing. Furthermore, predation keeps hydrological features such as creeks and streams in normal working order. Increased browsing on willows and conifers along Blacktail Creek due to a lack of predation caused channel incision because they helped slow the water down and hold the soil in place.
Broader ecological impacts can occur when an apex predator is removed, in the case of Yellowstone, this includes alteration to the?
hydrological features