Statistics for Top 10 Oldest Extant Animal Species on Earth

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	Years	Hint	Answer	% Correct
3.	550 million	A softbodied animal with an umbrella-shaped bell and trailing tentacles	Jellyfish	72%
5.	445 million	A marine arthropod	Horseshoe Crab	69%
7.	200 million	A primitive bony fish whose eggs humans eat	Sturgeon	59%
8.	200 million	A tiny crustacean	Horseshoe Shrimp	47%
9.	150 million	A living fossil that looks like a sea dragon	Frilled Shark	44%
4.	500 million	A marine mollusc with a shell in the shape of a whorl	Nautilus	41%
1.	2.8 billion	The first ever microbe to produce oxygen via photosynthesis	Cyanobacteria	37%
2.	580 million	A plant-like organism full of pores and channels	Sponge	28%
6.	360 million	A critically endangered deep sea fish	Coelacanth	25%
10.	120 million	An insect discovered in the Amazon rain forest	Martialis Huereka	21%

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