Earths History
How old is the Earth?
4.6 Billion Years old
Fossilized remains of organisms that lived for a relatively short period of geologic time, were geographically widespread, and abundant, which makes them useful for determining the relative age of rock layers.
Index Fossils
Structures like a human arm, cat leg, and whale flipper that have similar bone structures are called this.
Homologous Structures
Scientists study these early developmental stages to compare similarities in different species.
Embryos
How many kids does Mrs. Hart have?
2
If a fossil is found in a deeper layer, it is generally ______ than fossils in upper layers.
Older
Name an index fossil
Ammonite, Trilobite, Echinoids, Brachiopods, Graptolite, Coral
These structures have the same function but different internal structures (like a bird wing and an insect wing).
Analogous Structures
If embryos of fish, birds, and humans look similar early on, scientists infer this.
They have a common ancestor
What teacher at Prescott was once a firefighter?
What was happening for the first 85% of Earths history
Not very much, earth is getting stable, first signs of life developing
What are the 4 characteristics of a index fossil
1. distinctive, 2. abundant, 3. geographically widespread, and 4. existed for a relatively short geologic time period
Homologous structures provide evidence that species share this
Common Ancestor
What is the best stage of embryos to compare to see similarities?
The earliest stages
What Prescott teacher is in a band?
Mr. Coxford
Major events that help mark divisions in the geologic time scale.
Mass Extinctions
a method used to determine the chronological order of events or the age of objects in relation to one another, without assigning a specific numerical age
Relative Dating
Analogous structures tell us that the species
do not share a recent common ancestor, convergent evolution
When comparing embryos what do scientists look for
The general shape and structure
What school did Ms. Bruce and Ms. Cody work at before Prescott?
Chrysler Elementary
What is the name of the "era" are we currently in?
Cenozoic Era
a scientific method used to determine the specific, numerical age of an object or event, providing a chronological age in years
Absolute Dating
A scientist finds a fossil leg bone with similar structure to a modern horse’s. What can they infer?
They have a common ancestor
Why compare embryos
to see similarities not present in the adult stage
How many science teachers are at Prescott? (NAME US ALL)
7 (Hart, Faria, Chowdhary, Day, Azevedo, Martin, Salazar)