Life on Earth Flashcards
Roughly how long ago did the Earth begin?
About 3,500 million years ago
Over the years what has happened to the species living on Earth?
There has been a large number of species living on Earth, many of which are extinct now.
What did the very first things develop from?
Simple molecules that could copy and replicate themselves
What is not known about these molecules?
It’s not known whether these molecules were produced by conditions on Earth at the time or whether they arrived on Earth from an external source
What have experiments shown?
Experiments have simulated the harsh conditions on Earth millions of years ago, which led to simple organic molecules developing.
What does scientific evidence show?
There’s evidence of simple organic molecules existing in gas clouds in space and in comets.
