Which would be a negative impact of the development of widespread commercial aviation in the modern world? a.) economic wealth is created in many countries b.)people can travel almost anywhere in a very short time c.) communicable diseases are spread rapidly around the world d.) the tourist industry is boosted in many locales

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.