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the asteroid hit earth and it blasted tonnes of mud and dust into the atmosphere and that blocked out the sun wich killed the plants and then the herbivores had nothing to eat so they died then the carnivores had nothing to eat after they died so all the animals got wiped out
What else can I help you with?
Scientists theorize that human life began about how many years ago?
3.5 billion years ago
When did eukaryotic cells evolve?
1.2-1.5 Billion Years ago!
How long ago did sexual reproduction begin?
Sexual species appeared about 1.2 billion years ago.
In Which eon do you find the earliest fossils?
3.5 billion years ago. It was bacteria
When did life on earth begin?
The earth began to be formed over 4.5 billion years ago,but for millions of years nothing could live here.Gradually,the earth's crust and the atmosphere formed.The simplest form of life, bacteria and algae,probably began to grow less than four billion years ago.Human beings did not appear until about two million years ago.
When do we believe the big bang happened?
Approximately 13.8 billion years ago.
What happened to the earth 700 billion years ago?
Earth did not exist 700 billion years ago, nor did the universe. Earth is about 4.6 billion years old.
According to the big bang hypothesis what happened 20 billion years ago?
The universe did not exist that long ago. The universe as we know it is only 13.7 billion years old.
What year was it when the big bang happened?
That is estimated to have happened something like 14 billion years ago.
How many years ago did the big explosion occur?
What explosion And if you are talking about the Big bang it happened about 13.7 billion years ago
What happened 3.8 billion year ago?
About 3.8 billion years is about the age of the oldest firm evidence of life on Earth.
What happened 3.8 years ago?
About 3.8 billion years is about the age of the oldest firm evidence of life on Earth.
How long ago was our solar system formed?
Sciences say that the sun was formed 4,600,000 years ago
When did the first galaxies and stars develop?
About 13-14 billion years ago. Cosmologists are not in agreement as to what happened the first few million or billion years, but most agree that the age of our Universe is about 15 billion years.
Did earth form 50 billion years ago or 5?
Earth formed approximately 4.5 billion years ago, not 50 billion years ago or 5 billion years ago. This age estimate is based on radiometric dating of meteorites and rocks on Earth.
How many years ago did the solar system originate?
4.6 billion years ago or 5 billion years if you round up. :)
Describe what happened 65 billion years ago when there was a cosmic collision with earth?
Earth did not exist 65 billion years ago. However 65 million years ago an asteroid collided with Earth, triggering a mass extinction even that wiped out a wide variety of organisms, including the dinosaurs.
