Where were marsupials most abundant during the Cenozoic Era? What has been their fate thus far? What will be an ideal response?
Marsupials have always been the dominant mammalian fauna in Australia. They escaped
competition with placentals because Australia separated from Antarctica in the Late
Cretaceous-Paleogene, and has remained isolated ever since. They were also common and
diverse in the island continent of South America, until the Isthmus of Panama connected
North and South America about 5 million years ago—and then many of them became extinct
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Regarding the Indian Ocean Dipole (IOD), air is mainly descending at ________ and rising at ________.
A) A; C
B) A; D
C) C; A
D) C; B
Lakes lying in granite basins, such as those in the northeastern U.S., tend to become acidified by acid rain more readily than lakes lying in limestone basins, such as those found in the midwestern U.S. Why is this so?
A) The granite contains acidic minerals that dissolve in the rain water and are added to the lakes. B) Since the acidified water cannot percolate through the granite, the acid in the lakes becomes more concentrated. C) The limestone, which is calcium carbonate, serves to neutralize the acid in the rain. D) There is more acid rain in the northeast than in the midwestern regions of the U.S.
A(n) ____ is a test involving manipulations made on conditions of a particular observation
A) hypothesis B) experiment C) theory D) scientific method
The most serious problem caused by population growth is ________
A) too few jobs B) inefficient food transportation C) lack of farmland to meet food needs D) increasing demand for all resources E) crowding