1. Do Now & Announcements
Turn in Life in a Raindrop lab if you did not do so last class period.
Today: Dichotomous Keys
Unit 1 Test MON 9/21, TUES 9/22
I will give you a review guide on Friday

2. What is a Dichotomous Key?
The word dichotomous comes from Greek and English roots: dicho is Greek for “in two” tom means “to cut”
The –ous ending is from the English, meaning “full of.” So dichotomous means “to cut in two” or to “divide in two.” And that’s what you do at each stage of deciphering a dichotomous key – divide in two.

3. Dichotomous Keys
A dichotomous key is a grouping tool that scientists use to classify organisms based on observations.
The key focuses on one feature or characteristic at a time.
Usually, the key will list the presence or absence of something or maybe highlight opposites.
When using a dichotomous key, you will only look at one characteristic at a time and divide your specimens into two groups until each living thing has been placed into a category all of its own.

5. Look at 1 animal at a time. Start with “1” Choose a or b
Follow the directions

6. Pointed ears that stand up
Pets
Fur
Carnivorous
Pointed ears that stand up
Cat
Floppy ears that hang to sides
Dog
Herbivorous
Guinea pig
No Fur
Feathers
Bird
No feathers
Fish

8. Dichotomous Keys Lab You will need to get your materials from me
Part 1: Jelly Belly
Part 2: Alien Cards