Exam 13: The History of Life

The following numbered sets each represent a distinct group of organisms: (1) three toes per foot, feathers, cold-blooded, no finger adaptations (2) three toes per foot, body hair, warm-blooded, opposable thumbs (3) three toes per foot, feathers, warm-blooded, no finger adaptation (4) three toes per foot, body hair, warm-blooded, no finger adaptations Which of the following choices is the most likely to represent the order in which these groups would appear on an evolutionary tree, from oldest to youngest?

Explain two ways that mass extinctions can have a profound impact on evolved biodiversity in the ecosystem.

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

In the evolutionary tree below, which of the nodes corresponds to the most recent common ancestor of Troodontids, Dromaeosaurids, and Archaeopteryx?

The first eukaryotes evolved approximately ________ years ago.

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

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

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.

The Cambrian explosion

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?

Correctly match the definition with the correct geologic time period. -Permian