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Life Sci - Chap 8 #2

Study Guide

What is a fossil? traces or imprints of once living things preserved by geological processes
What is pressed together to form rock with a fossil inside? sediments
Relative dating is…. comparing one object to another to see what might be older - if buried deeper thought to be older
Absolute dating... method of measuring the age of objects in years
ESSAY - Explain the differences between relative dating and absolute dating. Relative dating compares objects / sees how deep they are buried to get an approximate age. Absolute dating is more precise - it uses carbon dating to get a specific age.
Time it takes half of the unstable atoms in an object to decay. half-life
The four eras of the Earth Precambrian, Paleozoic, Mesozoic, Cenozoic (P,P,M,C)
Species that no longer exists on Earth is……. extinct
Scale that is used to represent Earth's history and organize it into manageable parts. Geologic time scale
First organisms to appear on Earth did not need….. oxygen
Cynobacteria ….. produced food from light - this changed life on Earth; and are prokaryotes
In the Paleozoic era….. fish and trilobites ruled the ocean
Reptile that dominated the Mesozoic Era dinosaur
The time period that is the "Age of Mammals" Cenozoic (the era we live in now)
Past mass extinctions most likely occurred because of…. extreme climate changes
Example of Earth's conditions slowly changing is ……. continents moving
Name for continents in one landmass surrounded by gigantic ocean Pangea
Primates have….. binocular vision and opposable thumbs
Thing that sets hominids apart from other primates walking upright or bipedalism
Group of hominids that lived at the same time as homo sapiens Neanderthals
ESSAY - Explain the differences between humans and other primates - what sets us apart? Our skeletal features, intelligence, and walking upright set us apart from other primates.
What gas layer protects the Earth from the sun's radiation? ozone layer
Scientists that study fossils/history of life are called…... paleontologists
Plate tectonics…. theory that continents move and were once part of a continent called Pangea
Created by: msparks