In the early stages the embryos of four different species will look the same .For example, fish embryos and human embryos both have gill slits. In fish they develop into gills, but in humans they disappear before birth. That what makes them different.
I'm pretty sure it's Latin, acer means tree and I think rubrum is red
<span>: a medieval drama based on episodes from the life of a saint or martyr.
2 : mystery </span>play<span>.</span>