Scribe 2/22

First, we handed in our homework which was lab pages UP30-31. Then, we learned about the animal of the day. Today, the animal was a narwal. It belongs to the mammalia class. A narwal is a type of white whale and it has a "unicornlike horn" on its head. Nobody knows why it does, but one theory is that it uses it to joust with other narwals. After, we took our quiz on the vertebrate chart and we were allowed to use our charts. Next, Mrs. Stein went over notes with us. Here are the notes:

Phylogenic Trees

- shows evolutionary relationships

Embryo Development

- protostomes: mouth develops first

- most invertebrates

- deuterostomes: anus develops first

- chordates, echinoderms

Body Cavity Evolution

- coelom: body cavity lined fully with mesoderm

- supports internal organs and movement

- acoelomates: no cavity

- pseudocoelomates: cavity partially lined in mesoderm

- roundworms(nematods)

- coelomates: cavity completely lined in mesoderm

- annelids, mollusks, humans

Chordate characteristics

1. Notochord- supportive rod thru the dorsal side

2. Pharyngeal gill slits- present @ some point in development

3. Dorsal hollow nerve cord

4. Tail

After we finished the notes, Mrs. Stein explained the homework and wevhad a little time to work on it.

HOMEWORK:

1. Test Monday!!!!

2. Muddiest Points due by TONIGHT!

3. Muddiest Point Comments due by Friday @ Midnight! And yes they are mandatory. They are not optional this time!!!

4. Finding Oddball UP54-55 due TOMORROW

5. TV Ad due 2/28

NEXT SCRIBE IS ANDRIJANA!