1. UNIT 8 ANIMALS

2. Animals are diverse but share common characteristics

3. Animals are the most diverse kingdom -belong to DOMAIN Eukarya -range in size from 25 m to microscopic -found nearly everywhere on Earth

4. Animals share a set of characteristics -cells supported by collagen -reproduce sexually

5. More than 95% of all animal species are invertebrates

6. Each animal phylum has a unique body plan -Vertebrates= internal segmented backbone -Invertebrates= no backbone

7. Animals grouped by using a variety of criteria 3 criteria used -body plan symmetry -tissue layer -developmental patterns

8. Symmetry
a. Radial- body arranged in a circle around a central disks

9. Symmetry
b. Bilateral- divides body into equal halves along one plane

10. 2. Tissue layers Radial have 2 layers ectoderm- outside endoderm- inside

11. Bilateral have 3 layers ectoderm- outside endoderm- inside mesoderm- middle

12. Meaning: ectoderm- outside -skin and nervous system endoderm- inside -lines gut mesoderm- middle -internal organs and tissues

13. 3. Developmental patterns Protostomes- mouth forms from the blastophore, anus forms second -gut cavity formed from separation of mesoderm -spiral cleavage Deuterostomes- anus forms first and the mouth second -gut cavity formed from pouches -radial cleavage

15. Animal Tissues
Lack Tissues- sponges
2 Tissues- jellyfish & corals
3 Tissues
a. Protostomes- flatworms, annelids, mollusks,
roundworms, arthropods
b. Deuterostomes- echinoderms, chordates
Technology will be helping with relationships.

16. Porifera Cnidaria Platyhelminthes Annelida Mollusca Nematoda
Arthropoda
Echinodermata
Chordata
RADIAL
NO TISSUES
PROTOSTOMES
DUETEROSTOMES