As an evolutionary biologist, Sogin searched the genetic codes of many organisms to discover which gave rise to all the others. He investigated the genes of the sponge starting with gene sequencing to find the genetic blueprint of the sponge so he could compare it to those of other organisms. Sogin built a family tree based on comparing DNA sequences of various genes and confirmed what had been theorized: sponges are the first animal.
Mitchell Sogin, Evolutionary Biologist: Proof of the First Animal
Next Generation Science Standards for this Video
Mitchell Sogin compares the sequence of a gene found in all animals to look for common ancestry. The evidence he finds explains that sponges were the first animals.
Mitchell Sogin compares the sequence of a gene found in all animals to look for common ancestry. Fossil evidence had suggested this.
Scientist in this video
I'm obsessed with learning where we came from. And what I mean by that is not who your mother and father are, or your grandparents, but rather where do the organisms come from that gave rise to complex animals like us? -- Mitch Sogin