[jwalsh07]

The sudden appearance of large animal fossils more than 500 million years ago – a problem that perplexed even Charles Darwin and is commonly known as “Darwin’s Dilemma” – may be due to a huge increase of oxygen in the world’s oceans, says Queen’s paleontologist Guy Narbonne, an expert in the early evolution of animals and their ecosystems.

OK Darwins dilemna is "the sudden appearance of large animal fossils". Fine, dilemnas happen.

Now we have a hypothesis that states that the level of O2 and nutrients increased dramatically at some point for some reason. OK fine there as well.

Darwinian evolution, RM/NS/heritability, posits small changes over long periods of time. So, I'll need somebody to help me out with how increases in O2 and nutrient levels explains "the sudden appearance of large animal fossils".

[jwalsh07]

dilemna with two m's dumdum.

[Strategerist]

"the sudden appearance of large animal fossils".

To geologists and paleontologists that work in the Precambrian, "sudden" means "over several million years."

[metmom]

Still waiting for a scientific answer to your question....

[Quark2005]

Darwinian evolution, RM/NS/heritability, posits small changes over long periods of time. So, I'll need somebody to help me out with how increases in O2 and nutrient levels explains "the sudden appearance of large animal fossils".

The Cambrian "explosion" took place over millions of years; it was not "sudden" (a fact well-known to anyone who cares to do a few minutes of research).