Scribe Post 2/28/12

Today in Class...
-Turned in Starfish Lab
-Did Arthropod Lab (UP. 59-62)
-Did Phylum Chordata Notes (p.24-25)
-Watched Life in the Undergrowth (Last 5 minutes of class)

Arthropod Lab
In this lab we were trying to distinguish differnces between the three classes, Class Insecta, Class Crustacea, and Class Arachinda, of Phylum Arthropada. The three organisms we compared were a crayfish, a grasshopper, and a spider.
Crayfish Diagram (side view)-

Grasshopper Diagram (side view)-

Spider Diagram (side view)-

Even though these organisms share many similarities, they also have distinct differences due to the fact that they are in different classes. Here are a few differences between the organisms-
-number of leg pairs:
grasshopper: 3 pairs
crayfish: 4 pairs
spider: 4 pairs
-number of body regions:
grasshopper: 3
crayfish: 2
spider: 2
-antennae present:
grasshopper: yes
crayfish: yes
spider: no
-wings present:
grasshopper: yes
crayfish:no
spider: no

Notes
Phylum Chordata Traits:
-cord
-notochord
-pharyngeal slits
-post-anal tail

Vertebrates-chordates which have a backbone

Class Agnatha
-Jawless Fish
-2 chambered heart
-ectothermic or exothermic

Class Chonrichthyes
-Cartilaginous Fishes-Sharks, Skates, and Rays
-have flexible skeleton made of cartilage
-2 chambered heart
-ectothermic or exothermic

Video
The video showed various types of centipedes, some as long as 13 inches, and the ways they optained their prey.
If you missed it, here's a segment of it-

http://www.youtube.com/watch?v=bf-aN5ZlBNo

Homework...
-finish UP. 59-62
-Up. 73 due Thursday
-Study... Quiz..
-Nature due Friday

Next Scribe: Olivia