1. Do Now Sit with groups from Monday.
Get out homework reading for a check

2. The Scientific Method

3. Sea Butterflies & Amphipods

4. A Group of Scientists…

5. Studying toxic chemicals used to deter predators Observed something very interesting

6. Curious relationship between sea butterfly and amphipods

7. Observation
Many amphipods carry sea butterflies on their backs.

8. Question
Why are the amphipods “kidnapping” sea butterflies?

9. Hypothesize
The sea butterflies give amphipods a chemical defense

10. Hypothesis Cont.
They would be able to isolate a toxic chemical from the sea butterfly
Fish that normally feed on amphipods would avoid this chemical

11. Test the hypothesis

12. These were good results, but….
Were the fish reacting to a chemical from the sea butterflies? or
Were the fish just reacting to the feel of the sea butterflies in their mouths?

13. Controlled Experiment
Experiment that tests only one thing (variable) at a time.
Here they were looking for chemicals from sea butterflies

14. Control Pellets Experiment #1 Prepared plain fish food pellets
(no sea butterfly extract)
Control Pellets

15. Prepared fish food pellets that contained sea butterfly extract
Experiment #2
Prepared fish food pellets that contained sea butterfly extract
Experimental Pellets

16. Draw a Conclusion
Sea butterflies
produce a chemical deterrent.

18. Looking Forward….. Possible applications as a pest repellant?
Can it be useful in treating in human diseases?