Mammals evolved into larger organisms and began subdividing into various species in the _____________.
Which best describes the fossil record?
Scientists notice structural similarities between fossils of a land animal and an aquatic organism. They know the similarities are not a result of the two organisms having to adapt to similar environments. What can they attribute the structural similarities to?
Complex organisms with gills and lungs were major life forms that existed in the_____________.
Eons, eras, periods, and epochs, are all examples of ____________time.
______________ can be used to date fossils in rocks to give an approximate age.
Why are the Miller-Urey experiments essential to the theory of evolution?
Thylacosmilus is a marsupial, and Smilodon is a mammal. Thylacosmilus and Smilodon both have saber teeth, but they do not share an ancestor that had saber teeth. What are saber teeth for these organisms?
____ is a process by which organisms with characteristics suited to the environment will survive and reproduce.
Trilobites are index fossils because they ____.
Changes in the environment result in ____.
Which statement is true of the undisturbed rock layers shown?
Please select the word from the list that best fits the definition
Please select the word from the list that best fits the definition
Rock layers are correlated if they both contain the same ____.
The longest subdivision in geologic time is a(n) ____.
The Cenozoic was a time of _______.
Little is known about much of Earth’s early history because ____.
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