Genes of 500 million-year-old sea monsters live inside us – Livescience.com

More than half a billion years ago, headless sea creatures that looked like leaves, teardrops and coils of rope trawled the primeval seas. 
Although these primordial animals looked nothing like us, some of our most important genes may be 555-million-year-old relics from these long-lost creatures, according to a new study. 
The study found that Earth
‘s earliest and most primitive animals may have had genes that code for body symmetry, sensory organs and immune systems
that are still around today. 
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