I need help please. This is passage and question: As used in the passage the words “arid velt” means:

A. An opening at the bottom of the river
B. A swampy basin
C. A densely wooded bank
D. A dry open piece of land

Which of these international trade concepts results in specialization and trade increases in total world output? a) absolute advantage b) balance of payments c) absolute advantage d) international tariffs

Earth's atmosphere is unique among the planets and is able to support life because it contains a large amount of a) oxygen b) helium c) methane d) carbon dioxide

Anna’s mother prepares sauerkraut, a fermented dish made from finely cut cabbage and salt. lactobacillus bacteria present on the surface of the cabbage combine with salt to turn the cabbage into a crunchy, sour dish. what chemical process occurs to create this dish? a. alcoholic fermentation b. cellular respiration c. conservation d. lactic acid fermentation e. photosynthesis