Exam 13: The History of Life

If a plant evolved during the Permian period and spread across the continent of Pangaea,where might the fossils of this animal be found now?

During the Devonian period,plants evolved which of the following key innovations to overcome the harsh,dry conditions of life on land and flourish?

Monotremes,like the duck-billed platypus,are egg-laying mammals (oviparous),covered in hair,have mammary and skin glands,three ear ossicles,are diphyodont (their permanent teeth replace their "baby" teeth),and possess dentary-squamosal jaw articulation (the jaw bone hinges with the squamosal bone of the skull).Marsupials,such as kangaroos and koalas,are pouched mammals that have a vertical tympanic membrane in addition to being covered in hair,have mammary and skin glands,three ear ossicles,are diphyodont,and possess dentary-squamosal jaw articulation.Eutherians are the placental mammals that most people easily recognize as mammals.They are covered in hair,have mammary and skin glands,three ear ossicles,are diphyodont,possess dentary-squamosal jaw articulation,and have a vertical tympanic membrane. What traits are shared derived traits for monotremes,marsupials,and eutherians?

The Cambrian explosion resulted in the evolution of more than 17,000 species of an animal known as the trilobite.The sheer number of trilobite fossils found in modern times suggests that trilobites were very abundant,perhaps the rulers of the seas.Today,no living descendants of this group exist.What happened?

The evolutionary history of the protists remains unresolved,but it is being refined with the addition of DNA evidence.This is an example of

Because there is always new information to discover and interpret,scientists must be prepared to revise their ________ when there is evidence to suggest it is not correct.

What is a likely reason the Cretaceous extinction about 65 mya is the best studied mass extinction?

MATCHING Correctly match the definition with the correct geologic time period -Jurassic

The emergence of each new branch on the evolutionary tree represents

MATCHING Correctly match the definition with the correct geologic time period -Paleogene/Neogene

Roughly 360 mya at the end of the ________ period,a mass extinction wiped out 30 percent of animal families,including many fishes and trilobites.The terrestrial animals at this time would have included ________.

In order to best determine relationships among different organisms,scientists would examine

When making sourdough bread,bakers use a combination of microorganisms to produce the sour flavor and to leaven the dough before baking.The organisms typically used to produce the lactic acid that give sourdough its distinctive flavor are very small rod-shaped prokaryotic organisms known generally as Lactobacilli.These microorganisms are from the kingdom ________.The other organisms that produce the leavening effect are nonphotosynthetic eukaryotes,have cell walls,absorb their nutrients from their environment,and (in this case)are very tolerant of acidic environments.These microorganisms are from the kingdom ________.

Evolutionary tree diagrams representing the relationships between various organisms can be drawn only when those organisms share a

MATCHING Correctly match the definition with the correct geologic time period -Triassic

If you are watching a fictional movie set in a land dominated by flowering plants,plus advancing and retreating glaciers and a cast that includes a human,a wooly mammoth,a saber-toothed cat,and dinosaurs,which characters would be most out of place in the setting according to the geological time line of life on Earth?

Which of the following events occurred between each branch on an evolutionary tree?

According to the tree below,which of the following combinations of organisms are most closely related?

At the base of the evolutionary tree of all life is the

Which of the following statements about bird evolution is NOT correct?