Scientists
Did not believe in spontaneous generation and conducted an experiment to disprove it.
Who is Francesco Redi?
All living things come from pre-existing living things.
What is biogenesis?
The age of a fossil is determined by comparing its placement with that of fossils in other layers of rock.
What is relative dating?
contended that the atmosphere of primitive Earth contained:
ammonia, hydrogen gas, water vapor, and hydrocarbons, such as methane.
Who was Oparin?
It was once believed that maggots arise from this.
What is rotting meat?
Did an experiment with a broth to show microorganisms do not spontaneously generate.
Who is Lazzaro Spallanzani?
Prior to the 17th century, scientists believed in this idea of how life arises.
What is spontaneous generation?
The actual age of a fossil given in years.
What is absolute age?
Set up an experiment to test the Oparin hypothesis.
Who are Miller and Urey?
The dependent variable in Redi's experiment.
What was a cloth covering?
Finally disproved spontaneous generation once and for all.
Who is Louis Pasteur?
Atoms of the same element that differ in number of neutrons.
What is an isotope?
The earliest evidence of life on Earth come from fossils of these.
What are microorganisms?
Miller and Urey's experiment produced these.
What are amino acids?
Invention that revealed the world is teeming with microorganisms.
What is the microscope?
Produced amino acids using gases presumed to be present in the early atmosphere of Earth.
Who were Miller and Urey?
The amount of time it takes an isotope to decay 50%.
What is it's half life?
The estimated age of the Earth.
What is over 4 billion years?
What new evidence shows Early Earth's atmosphere being composed of.
What are carbon dioxide, nitrogen and water vapor?
Also known as spontaneous generation.
What is abiogenesis?
Many scientists discredited Spallanzani's experiment due to the lack of this.
What is the "Vital Force"?
Only good for organisms less than 75,000 years old.
What is carbon dating?
Isotopes used for dating older rocks and sediment. There are 2.
What are Potassium 40 and Uranium 238?
It is currently thought that the first organic compounds were formed around these.
What are hydrothermal vents?
Collections of molecules (microspheres) surrounded by a membrane-like structure.
What are protobionts?