Vertebrates /ˈvɜrtɨbrəts/ are animals that are members of the subphylum Vertebrata /-ɑː/ (chordates with backbones and spinal columns). Vertebrates include the overwhelming majority of the phylum chordata, with currently about 64,000 species described. Vertebrates include the jawless fishes, bony fishes, sharks and rays, amphibians, reptiles, mammals, and birds. Extant vertebrates range in size from the frog species Paedophryne amauensis, at as little as 7.7 mm (0.3 inch), to the blue whale, at up to 33 m (110 ft). Vertebrates make up about 4% of all described animal species; the rest are invertebrates, which lack backbones.
The vertebrates traditionally include the hagfishes, which do not have proper vertebrae, though their closest living relatives, the lampreys, do have vertebrae. Hagfishes do, however, possess a cranium. For this reason, the vertebrate subphylum is sometimes referred to as "Craniata" when discussing morphology. Molecular analysis since 1992 has suggested that the hagfishes are most closely related to lampreys, and so also are vertebrates in a monophyletic sense. Others consider them a sister group of vertebrates in the common taxon of Craniata.
Marc W. Kirschner (born February 28, 1945) is an American cell biologist and biochemist and the founding chair of the Department of Systems Biology at Harvard Medical School. His research involves problems in cell and developmental biology, such as the dynamics and function of the cytoskeleton, the regulation of the cell cycle, and the process of signaling in embryos, as well as the evolution of the vertebrate body plan, and applying mathematical approaches to biology.
Kirschner was born in Chicago, Illinois, on February 28, 1945. He graduated from Northwestern University with a B.A. in chemistry in 1966. In 1971, he received his doctorate in biochemistry from the University of California, Berkeley. He held post-doctoral positions at UC Berkeley and at the University of Oxford in England. He became assistant professor at Princeton University in 1972. In 1978 he was made professor at the University of California, San Francisco. In 1993, he moved to Harvard Medical School, where he served as the chair of the new Department of Cell Biology for a decade. He became the founding chair of the HMS Department of Systems Biology in 2003. He was named the John Franklin Enders University Professor in 2009.
It's seven a.m.
Put my chap stick on.
Gonna read a maga about the number Seventeen.
Bathroom time in my very own office.
I do my hair then I do my teeth.
Then I shave my legs.
Just kidding I'm a bird.
Gotta get down to my green van.
Gosh it looks so green.
It even has a dent.
I have seven choices.
'Cuz I'm just a loner.
Gotta go make friends today.
Let's go to the zoo~.
~Chorus~
It's Tuesday, Tuesday.
Gotta do a hop on Tuesday.
Write an essay,
do ballet,
then we'll see how much we weigh.
Tuesday, Tuesday.
Gotta do a hop on Tuesday.
Stretching out this rubber band,
Girl Scout cookie in my hand.
Baking a, baking a CAKE.
Printing out, printing out, DRAKE.
Now it's time to watch T.V.
My favorite show is on at three.
~Second verse
Sittin' on top 'cuz i have no plans.
Bought some dirt so I planted plants.
Runnin' around,
looking at this light.
Pokemon White all day, all night.
Yeah, I got sniffles up my nose.
I wear this hat to look like a fly.
Bathroom break,
three times today.
Gotta wash your hands,
don't forget the soap.
Kicking soccer balls downtown.
Kicking other balls,
knock down.
Excersizing with my bike.
Me and you look much alike.
~Chorus~
It's Tuesday, Tuesday.
Gotta do a hop on Tuesday.
Write an essay,
do ballet,
then we'll see how much we weigh.
Tuesday, Tuesday.
Gotta do a hop on Tuesday.
Stretching out this rubber band.
Girl Scout cookie in my hand.
Baking a, baking a CAKE.
Printing out, printing out DRAKE.
Now it's time to watch T.V.
My favorite show is on at three.
Yesterday was Monday Monday
Today it is Tuesday Tuesday
We, we, we punched an owl.
We punched an owl.
His eyes were furry like a creepy guy.
Tomorrow is Wed-nes-day.
And Thursday comes after WORDS~.
I don't want this Tuesday to END~!
~Rap part~
I'm just a creep hanging in this van.
I ate a bug.
I thought it was a pecan.
Walkin' outside,
into the driveway.
I didn't go anywhere.
I felt like a blue jay.
Grammie gave me a pack of tissues.
How did she know I had a lot of nose issues?
Monday, Tuesday, Wednesday, Thursday, Saturday, Sunday.
IT"S TUESDAY GUYS!
~Chorus~
It's Tuesday, Tuesday.
Gotta do a hop on Tuesday.
Write an essay,
do ballet,
then we'll see how much we weigh.
Tuesday, Tuesday.
Gotta do a hop on Tuesday.
Stretching out this rubber band.
Girl Scout cookie in my hand.
Baking a, baking a CAKE.
Printing out, printing out DRAKE.
Now it's time to watch T.V.