Eons, eras, periods, and epochs, are all examples of ____________time.
Mammals evolved into larger organisms and began subdividing into various species in the _____________.
______________ can be used to date fossils in rocks to give an approximate age.
Complex organisms with gills and lungs were major life forms that existed in the_____________.
Shifts in the rock layer locations cannot account for gaps in the rock record
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?
Why are the Miller-Urey experiments essential to the theory of evolution?
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?
Determining the order of events and the relative age of rocks by examining the position of rocks in a sequence is called ____.
Please select the word from the list that best fits the definition
Which of these statements best sums up evolution?
Dinosaurs were definitely cold blooded.
Life-forms that existed during the Paleozoic Era included ____.
A scientist makes the argument that she has found DNA evidence that shows that evolution does not exist. What would her evidence have to show for her to be correct?
Please select the word from the list that best fits the definition
If the same index fossils are found in two separate rock layers, the two rock layers most likely
In a series of undisturbed rock layers where shale lies between sandstone below and limestone above, the ____.
Gymnosperms, or seed-bearing plants, were the only abundant form of plant life during the Mesozoic Era.
What do gradualism and punctuated equilibrium have in common?
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