Geologic Time Review

Trilobites are index fossils because they ____.

• changed slowly through time
• lived over large areas of the world
• all of the above

Which is oldest?

• Sharks
• Reptiles
• Trilobites

Which ERA is oldest?

• Paleozoic
• Mesozoic
• Cenozoic

Which is the Age of Mammals?

• Paleozoic
• Mesozoic
• Cenozoic

Which of these statements best sums up evolution?

• rapid change in species’ habits and features
• punctuated change in a population
• change in a population through new species being made
• change in a population through genetic variation over time 

A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?

• the birds living in the area of the bones
• the weather conditions in the area of the bones
• the kinds of trees living in the area of the bones
• the index fossils in the area of the bones

Changes in the trilobite exoskeleton can be attributed to ____.

• changing environments
• inter-species mating

Plate tectonics may affect  evolution because movement of plates may cause a change in ____.

• Geologic time scale
• the environment
• Pangea

Angiosperms are the dominant land plant today because they developed ____

• heavy, thick bark
• hard seed coats
• deep root systems

A group of organisms capable of interbreeding or exchanging genes

• Mutation
• Species
• Adaptation
• Fitness