Statistics for Early Earth history

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Hint	Answer	% Correct
The earth formed...	4.6 billion	67%
what most likely brought water on earth	asteroids	67%
Major event,Arthropoda,chordates,and mollusks formed in this event	Cambrian explosion	67%
Major ice age event called	snow ball earth	67%
The organelle to first merge with eukaryote cell	Mitochondria	50%
When did early life first form	3.5 billion	17%
domain with nucleus that contains dna	Eukaryote	17%
When plants went on land	500 million	0%
When multicellular life formed	600 million	0%
Large predator in Cambrian	Anomalcaris	0%
What was the first producer organism	Cyanobacteria	0%
period when complex multicellular life formed	Edicarian Period	0%
what major cooling event happened	Huronian glaciation	0%
First chordate	Pikaia	0%
first order of animals	Sponge	0%