Pangea
The earth was once one giant land mass.
Pangea
Useful because they tell the relative ages of the rock layers they are found in.
Index Fossil
Inherited Traits
What is used to date the rock layers?
Index Fossils
These shifted over time to cause the earth to break apart.
Tectonic Plates
All the information scientists have gathered is called the
Fossil Record
Which process best describes why organisms have different characteristics?
Biological Evolution
Only type of rocks fossils are found in.
Sedimentary Rocks
It will increase food supply.
Along with similar rock structures, these found on different continent's prove Pangea once existed.
Fossils
Must be dead, have hard parts, and be buried quickly.
Criteria to become a fossil
Random changes in an organisms DNA
Mutations
In horizontal sedimentary rock layers, the oldest layer is at the bottom. The youngest layer is at the top.
Law of Superpostition
Plants or animals with desired traits are chosen and are bred together to produce those desired traits.
Selective Breeding
Scientists have suggested that the plates are in constant motion. What will eventually happen if the plates continue to move the way that they have been moving?
They will combine again.
When the object is buried by sediment, water rich in minerals
Petrified Fossil
A species lacking variations will eventually become what?
Extinct
Rock layers help geologist understand the evolution of life on Earth by providing this information.
Order of events
New gene segments are inserted into plants to create a new variety.
Genetic Engineering
Theory derived from Alfred Wegner.
Theory of Plate Tectonics
A hollow area in sediment in the shape of an organism or part of an organism.
Mold Fossil
Two animals with similar structures that had different uses were found in the same rock layers. These species were considered?
Homologous
Dinosaurs are found in a rock layer below saber tooth tigers. Geologist can infer what from this information?
Dinosaurs existed before the saber tooth tiger
A new use in biotechnology that raises ethical concerns.
Genetically modifying animals.