24) Foe many years, scientists believed that alimost all animal lineages burst i

Question

24) Foe many years, scientists believed that alimost all animal lineages burst into being during the Cambrian many recent findings of era (just after the end of the Precambrian super eon). However, there have been animal-like fossils and "trace fossils" (fossils of an animal-like Precambrian. Which of the following best explains why it took so long to realize there was anlmal in the Precambrian? organism's movement) from the late -like life A) Animals from the late Precambrian had soft bodies B) The global climabe was such that there was poor fossilization in the Precambrian. C) There were many hard-shelled animals in the Cambrian D) There were no animals in the Precambrian 25) Which listing of geological periods is in the correct order, from oldest to most recent? A) Devonian, Cambrian, Permian, Cretaceous C) Cambrian, Devonian, Permian, Cretaceous B) Permian, Cambrian, Cretaceous, Devonian D) Cambrian, Permian, Devonian, Cretaceous 26) Approximately how far back in time does the fossil record extend? A) 5.0 billion years B) 3.5 billion years C) 50 million yearsD)35 million years The question(s) below refer to the following paragraph A sediment core is removed from the floor of an inland sea. The sea has been in existence, off and on, throughout the entire time that terrestrial life has existed. Researchers wish to locate and study the terrestrial organisms fossilized in this core. The core is illustrated as a vertical column with the top of the column representing the most recent strata and the bottoen repeesenting the time when land was first colonized by life. Key e camivorous tetrapods -herbivarous invertebates " e plants and tungl 27) If arrows indicate locations in the column where fossils of a particular type (see key in the accompanying figure) first appear, then which core in the figure has the most accurate arrangement of fossils? D) core C A) core D B) core B C) core A

Explanation / Answer

24) A) Animals from the precambrian had soft bodies

The fossils of the animal species were small, one centimeter long, sponge like creatures. Fossils believed to represent the oldest animals with hard body parts were recently discovered.

25)C) Cambrian, Devonian, Permian, Cretaceous

Cambrian, Devonian, Permian - Paleozoic Era

Cretaceous - Mesozoic era

26) B) 3.5 billion years

They are microfossils that resemble bacteria.

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