Historical Development of The Concept of Life
Earth and Life Science 2.1
Terms in this set (29)
Radioactive Decay studies of rocks
Based on this it was revealed that Earth is around 4.5 billion years old- 1 billion years older than the oldest fossils
Extra Terrestrial Origin
Hypothesis explains that life originated from another planet outside the Solar System
This theory presumes that the "seed" of life exists all over the universe and can be propagated through the space, and that life on Earth originated from those seeds.
Theory where many people believed that life was put on early Earth by divine forces. Creation theories are common to many of the world's religions and cultures.
Origin from Non-Living Matter
Belief that life arose on Earth from inanimate matter after Earth had cooled. Random events produced stable molecules that could self-replicate. Natural selection favored changes in the rate or reproduction which eventually led to the first cell.
Stanley Miller and Harold Urey
Performed an experiment that replicated the early Earth conditions and provided proof of amino acids and other molecules could be formed.
Hydrogen, Carbon Dioxide, Methane, Water Vapor, Nitrogen, Ammonia and Carbon Monoxide
Simple molecules that were probably present in the early Earth's atmosphere
The building blocks of proteins
Seperates the cell from its environment which contains lipids
When lipids mix with water they form bubbles that are called?
Scientists believed that the first cells were the?
Organisms whose cells have no nucleus
The first prokaryotes
They do not need and could not tolerate oxygen
4.5 Billion Years Old
Estimated age of the Earth
(True bacteria) Most living bacteria including those that causes diseases and decomposition
(Ancient bacteria) rare and are found mainly in hostile environments where conditions resemble those of early Earth (salty lakes, hot springs, swamps, ocean floors)
More complex life formed-appeared in the fossil record which are known as?
Plants and fungi
The first living things to populate the surface of the land
Animals with hard covering and jointed legs and the first animals to live on water
Rapid diversification of animals, plants and fungi appear, origin of the humans (about 2 million years ago)
Earliest animals; first multicellular organisms; diverse protists
Diverse and abundant bacteria
First bacteria appeared
4.0 BYA or 3.8 billion years ago