Chapter 32 animal diversity[1]

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Transcript of Chapter 32 animal diversity[1]

  • 1. Hannah Love12/01/2011p. 654

2. Animals are heterotrophs Heterotrophs: relies on other organisms for food (as opposed to autotrophs) 3. Eukaryotes: Organisms that carry geneticmaterial (DNA) in the form of chromosomeswithin a distinct nucleus Multicellular: Made of multiple cells Animal cells have no cell walls Held together by structural proteins (like collagen) Muscle and nerve cells are unique to animals 4. Cleavage: a succession of mitotic cell divisions 5. Most animals reproduce sexually Some animals develop directly into adultsthrough transient stages of maturation Like humans Metamorphosis: Developmental transitionthat turns the animal into a juvenile Juvenile: resembles an adult, but not entirely sexually mature 6. Neoproterozoic Era 1 Billion 542 Million Years Ago Ediacaran biota: Early eukaryotic bacteria Paleozoic era 542-251 Million Years Ago Cambrian Explosion: dramatic explosion in the growth of animal diversity (535-525 million years ago) 7. Mesozoic era 251-65.5 Million Years Ago Animals began to spread into new habitats First dinosaurs and mammals Cenozoic era 65.5 Million Years Ago Present Began with mass extinctions Mammals rise 8. Radial Symmetry: hasno left and right side,any imaginary slicecreates mirror images Bilateral Symmetry:only one imaginaryslice can divide thisinto two mirror imagesides right and left 9. Tissues: integratedgroup of cells with acommon function Maintain organization within the animals body 10. Body cavity: fluid- or air-filled space 11. Phylogeny: historyof organism lineagesas they changethrough time New views of animalphylogeny areemerging frommolecular data