Early Earth
What gas was NOT present in Earth's early atmosphere: Oxygen, Carbon Dioxide, or Methane?
Oxygen
If our history was a 24-hour clock, how long have humans been on Earth, and WHY is that important?
1 second, it shows that we have not been around very long in comparison.
What was the era when life first appeared on Earth?
The Precambrian
What was the dominant group of land animals during the Mesozoic Era?
What was the Earth like when it first formed?
"A hot mess," volcanoes going crazy, the atmosphere was poison!
Which appeared first, fungi or fish?
Fungi
Where did the first life form?
The Oceans
How do we seperate the Eras of Earth's history?
By major historical events
What was the name of the simple life forms that appeared on our planet about 3.5 billion years ago?
Prokaryotes
What appeared first, mammals or birds?
Mammals
What gas increased in level in the atmosphere about 2.5 billion years that allowed for multicellular life?
Oxygen
These are fossilized mounds formed from thin layers of sediment.
Stromatolites
What was the first kind of organism to do the process of Photosynthesis?
Cyanobacteria
How long have humans been on this Earth?
200,000 Years
How many extinction events has the Earth had?
Five
Strands of these can transfer genetic information, and they may have originated in tidal pools.
RNA
What is one of the theories on how life began on our planet?
Energy from lightning and radiation from space/ Deep Sea Vents/ Brought here on an asteroid
If you're happy and you know it clap your hands.
*Clap* *clap*
What complex cells formed that eventually supported more complex life forms?
Eukaryotes
These are heritable traits that increase an organism's chances of survival and reproduction.
Adaptations