Sponges are outliers in biology’s big bang, the Cambrian explosion. Their embryos appear in Precambrian strata, leading some to consider them primitive.
To explain away the Cambrian explosion has been and remains a high priority for Darwinists.
Günter Bechly explains why the Precambrian fossil Namacalathus fails as a transitional precursor to the Cambrian explosion.
The notion that many genes would be required for the Cambrian explosion may seem unsurprising — what is surprising is that anyone would challenge the idea.
Design with interdependent layers presents a challenge to neo-Darwinism. Natural selection is oblivious to anything but an immediate beneficial variation.