28) Whatever its ultimate causets), the Cambrian explosion is a prime example of

Question

28) Whatever its ultimate causets), the Cambrian explosion is a prime example of A) a large meteor impact C) adaptive radiation B) evolutionary stasis D) mass extinction 29) The largest extinction, measured as a percentage of species that disappeared, occurred at the end of which C) Permian geological period? D) Cretaceous E) Silurian A) Tertiary B) Devonian A) Mass extinctions cause a larger proportion of organlsms to go extinct than background extinctions B) Mass extinctions occur over a longer period of time than background extinctions. C Mass extinctions typically result from Hex gene mutations, and background extinctions typically 30) How do mass extinctions differ from background extinctions? result from changes in weather patterns. D) Mass extinctions, but not background extinctions, are generally caused by competition. 31) How mamy mass ? ?ncT ons where there? c) four Di fue B) three 32) The origin of the universe is said to be A) 128 Mya B 4.6 Bya c)13.7 Mya D) 14.6 Bya 33) Which era represents the "mew life," the Age of Mammals? A) Paleozoic C) Mesozoic D) Cenozoic 34) During plate tectonics, which of the following is true? A) Plates separate from each other at non-adjoining boundaries B) Adjoining plates slide past each other at a common fault D) None of the above Q One plate moves away from another causing a convergent boundary 35) The current most natural subdivision of organisms is: A) Eubacteria, Eukarya, Archaca C) Plant, Animal, Protista B) Animal, Plant D) Eukaryote, Prokaryote 36) All of the following are consequences of competition except A) reproductive power C) resource partitioning B) character displacement D) competitive exclusion

Explanation / Answer

28) The correct option is C. adaptive radiation.

The Cambrian explosion is a period where most of major phyla have been dated to, it is a prime example of adaptive radiation. Before this period, organisms were very simple. They developed different morphological and physical traits as a result of sudden change in the environment.

29) The correct option is C. Permian.

The Permian period is the largest mass extinction on the Earth and it had started about 299 million years ago. The Permian extinction is estimated to have wiped out more than 90 % of all marine species and 70% of land animals.

30) The correct option is A. Mass extinctions cause a larger proportion of organisms to go extinct than background extinction.

Mass extinction is an event in which a large number of species go extinct over a short period caused by major events than background extinction, which is the rate of extinction going down over time and not caused by major events.

31) The correct option is D. Five.

There have been five mass extinction events in the history of Earth, which are Cambrian Explosion, Ordovician-silurian Extinction, Devonian Extinction, Permian-triassic Extinction, Triassic-jurassic Extinction and Cretaceous-tertiary Extinction.

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