When and how the Earth was formed?
Condition of Early Earth
What was the first organism and what was the Earth like at that time?
When photosynthesis first occurred and what effect it had on Earth?
How mitochondria or chloroplasts evolved?
100
What is the approximate age of the Earth?
What is 4.543 billion years? 
100
What is the most prominent gas in Earth´s early atmosphere?
What is carbon dioxide?
100
What was the structure of Earth´s first organisms?
What is RNA in a membrane of phospholipids?
100
What organisms did photosynthesis originate from?
What are bacterial organisms? 
100
How did both the mitochondria and chloroplasts evolve?
What is through bacteria that become engulfed by eukaryotic organisms (Endosymbiotic Theory)?
200
What would have been able to survive given the Earth´s atmospheric conditions?
What is nothing?
200
What was Earth´s atmosphere deprived of in its early years?
What is oxygen?
200
What was Earth´s first organism?
What are single-celled micro-organisms? 
200
The first organisms that did photosynthesis did not require this necessary gas, used at many steps in the photosynthesis process?
What is oxygen (O2)? 200
When did these organelles evolve?
What is 1.45 billion years ago? 
300
Because of the intense heat and pressure, what was Earth first formed as?
What is a molten planet? 
300
What gas did scientists believe was found on Earth which made it unlivable?
What is methane?
300
Approximately when did the first organisms appear on Earth?
What is 4 billion years ago?
300
What theory believes that eukaryotic organisms evolved from prokaryotic cells?
What is the endosymbiotic theory?
300
Which of the two evolved first?
What is the mitochondria? 
400
How was the Earth formed?
What is through gravity pulling rock and dust together for thousands of years?
400
What did scientists believe released dissolved gasses into Earth´s early atmosphere?
What is through magma flowing from deep in the Earth? 
400
What were the Earth´s conditions during the Precambrian Era?
What is low temperatures as a result of a low around of carbon dioxide?
400
Photosynthesis occurring in bacteria allowed for oxygen to become useful because?
What is by producing it as a product in sufficient quantities? 
400
Although both the mitochondria and chloroplasts evolved from the endosymbiotic theory, it is proven that chloroplasts did not evolve in this matter. This is because?
What is chloroplasts not being free living to begin with, eventually dying without reproducing, and thus needing to be replaced?
500
How is Earth still forming today?
What is through plate tectonics and erosion? 
500
By determining the oxidation state of the magmas that created zircon, scientists could determine?
What is the type of gasses present in atmosphere?
500
Because of the lack of chemical fuel, bacteria began to find a new source of energy known as?
What is photosynthesis? 500
How does the oxygen released in photosynthesis benefit humans?
What is by giving humans the oxygen necessary to survive?
500
In eukaryotes, not both of these organelles are found in all organisms because?
What is chloroplasts are only found in plant cells?