What is a geologic timescale?
A model of events organized by major geological and biological events.
How are scientists able to get an exact age of a fossil?
By analyzing the radioactive decay of that fossil.
Compare relative and absolute time
relative is approximate based on comparison; absolute is exact in minutes, days, seconds, years, etc..
Explain evolution
species of organisms change over time
Describe adaptation
adjustments species make to survive changes in the environment
Explain natural selection
Only the strong survive and make offspring
Name one geologic and one biologic from Jurassic period
continents began to move, Atlantic ocean opens; Dinosaurs existed, Fossil fuels are forming
Did mammals exists with Dinosaurs?
yes. Small ones similar to rats; Megazostradon
True or False? -Fossils are bones from long ago.
False- Fossils can form from bones, but the process of fossilization gradually transforms the bones—or other remnants of the organism—into rock.
What is paleontology?
the study of once living things; the branch of science concerned with fossil animals and plants.
What is an example of Relative dating used in science?
scientists relate rock layers to each other using index fossils; superpositioning
Describe half-lives as it applies to radiometric dating
The time it takes for half of the parent isotope to decay
How long would it take 250 grams of Carbon 14 to become 62.5 grams? (HLT 5,730) How many half lives have passed?
11,460 years; 2
Why is natural selection a mechanism for biological change?
It drives evolutionary change by passing on traits and becoming dominant version of species.
What is Katelyn's favorite color?
Black
What is Katelyn's favorite activity?
writing novels
