2. Big ideas The process of evolution drives the diversity and unity of life. Biological systems utilize free energy and molecular building blocks to grow, reproduce and maintain homeostasis. Living systems store, retrieve, transmit and respond to information essential to life processes. Biological systems interact, and these systems possess complex properties.

3. 1. What are sponges?

4. 2. General traits 3. invertebrate animal- no backbone 3. multicellular eukaryotes 1. What are sponges?

5. 2. specialized cells, but NO tissues (tissues = groups of cells with the same job) 3. two layers of cells separated by jellylike mesoglea 1. What are sponges?

6. 2. Sponges evolved during Paleozoic Era (540 mya) from flagellated protozoa

7. 2. Collar cells w/flagella pulls in water 2. water enters ostia (tiny pores) and Exits osculum (large pore)----filter food out 1. How do sponges gather food for energy ?

8. Water carries food in & gases in, and wastes and gases away.

9. Video clip of sponges feeding

10. 2. digestion occurs inside each cell 3. NO DIGESTIVE SYSTEM OR ORGANS 2. Special cells carry food to cells. 3. NO BLOOD 1. How do sponges gather food for energy ?

11. 2. Skeletal structure of sponges 3. spicules (of hard silica) and spongin (of soft protein) 3. skeleton made by special cells 1. How do sponges build bodies?

12. 2. Reproduction in sponges 3. asexually w/ budding 3. sexually w/ sperm & egg 1. How do sponges transmit genetic info? http://www.wingswildlife.com/video_clips/PB02_057

13. 2. Development of a sponge 3. zygote (fertilized egg) develops by mitosis 3. zygote develops into swimming larva… 3. larva attaches to rock & grows into sessile sponge

14. 2. habitat for animals 2. symbiotic relationships w/ algae & bacteria 2. toxins for medicine 1. Why are sponges important?

15. Open note quiz sponges 1 1. What is an invertebrate? 2. The jellylike material between the ectoderm and endoderm of a sponge is called: 3. Pores that allow water into a sponge are called:

16. 4. T/F A sponge has tissues and systems. 5. A sponge is a (heterotroph, autotroph) 6. Carl Linnaeus introduced the terms genus and _________________.

17. Labs: 1. Does a synthetic sponge or real sponge hold more water?