Dead Bio Major Walking

I have a Bio midterm in two hours. And I don't know as much as I think I should for it. I"m screwed. But I feel calm about it today. Last night I was in a panic. It wasn't so bad until after I looked at Darrow's old animal diversity/behavior exam from when he was in Intro. They had a different prof, but they did some of the same things. Like phylogeny. Which I don't know crap about. Well, I do know that making a phylogenetic tree of Porifera, Craniata, Cnidaria, Platyhelminthes, Rotifera, Annelida, Mollusca, Mandibulata, Echinodermata, Hemichordata, and Nematoda would be so much easier were it not for the fact that Echinodermata and Hemichordata are very similar to Craniata except for a couple things in them that are very primitive. But hey, look at that, I just rattled off a list of the eleven phyla I'm supposed to know. I guess it's not that quite that bad. And I do know what constitutes a complete excretory system and that Mollusca do have one. All the phyla mentioned above except for Porifera, Cnidaria, Echinodermata and Hemichordata have them. And Annelida and Mandibulata are the only two that have metamerization. Meaning they have segmented bodies. Craniata is the only phylum that has an endoskeleton and a closted circulatory system. Everyone else but Porifera, Craniata, Platyhelminthes and Rotifera have open circulatory systems. Oh, wait, Echinodermata have endoskeletons as well. Porifera and Cnidaria have no coelom, and Platyhelminthes are acoelomates, Rotifera and Nematoda are pseudocoelomates, and everyone else are coelomates. Porifera have no nervous system, Cnidaria have nerve nets, and everyone else has true nervous systems. Porifera don't have anything, actually, because they're sponges. Cnidaria are diploblastic, and all the other phyla are triploblastic. Cnidaria and Echinodermata have radial symmetry, and all others except Porifera have bilatteral symmetry. Craniata, Echinodermata, and Hemichordata have readial cleavage and the others have spiral cleavage. Damned Echinodermata and Hemichordata! They make putting all this shit into a phylogenetic tree so freaking hard. It seems like there's so much I have to know for this test. Phylogeny is only part of it. There's all the behavior crap. But that's more common sense kind of stuff, as opposed to the phylogeny, which is mostly memorization and frustration.

I'm going to quit worrying now. Things will be okay, despite the start to the day that I had. I stayed up until 2:30 in the morning studying, then I got up at 8:30 to go to Hum lecture. Nathalia's lecture. Boring as hell. And I somehow managed to stay awake throughout. And when I left, my bag was soaked in coffee because this girl had spilled her coffee and didn't bother to clean it up. Grr. But, the day has gotten better. And the sun is shining. It'll be okay, right?