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21 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Metazoa is also known as____ _____.
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Kingdom Animalia
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LECTURE 2: Fossils
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Basic Metazoan Diversity
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Ph. Porifera
Ph. Placozoa "Diploblasts" - Ph Cnidaria - Ph Ctenophora "Triploblasts"(= bilateria) - Deuterostomia - Protostomia - Incertai sedis: Chaetognatha, Bryozoa, Xenoturbellida, etc. |
LECTURE 2: Fossils
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Phylum Porifera = ?
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Sponges: little tissue differentiation
- No body layer |
LECTURE 2: Fossils
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The 3 germ layers of triploblasts are...
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...ectoderm, endoderm, and mesoderm.
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LECTURE 2: Fossils
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Phylum Placozoa
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Generally classified as the single species <i>Trichoplax adhaerens</i>. The name literally means "flat animals"
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LECTURE 2: Fossils
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Name the 2 germ layers of Diploblasts. What's the third gelatinous and sometimes acellular layer called?
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Skin, Gut, and Mesoglea
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LECTURE 2: Fossils
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Name 2 diploblastic animals
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Cnidaria (Jellyfish, corals, anemonae) and Phylum Ctenophora (comb jellies)
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LECTURE 2: Fossils
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The 2 typical conditions of a triploblastic animal are....
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bilaterally segmented, the presence of 3 body layers
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LECTURE 2: Fossils
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About how old is the Burgess Shale from Canada? What period was is it located in?
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Burgess Shale was about 525 Million years old during the Cambrian.
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LECTURE 2: Fossils
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How old is the earth (about)?
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4.6 billion years old
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LECTURE 2: Fossils
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When was the first indirect evidence of life? What kind of organisms were they?
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Indirect evidence of prokaryotic organisms has been dated to about 3.8 billion years ago
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LECTURE 2: Fossils
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The first CERTAIN traces of prokaryotic life occured ___ ___ years ago. This was through the secondary chemical evidence of _____.
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2.5 billion; cyanobacteria
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LECTURE 2: Fossils
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The first eukaryotic life was ___ ___ and is ___ to ___ billion years old.
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benthic algae; 1.7 to 2 billion years old
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LECTURE 2: Fossils
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Molecular clocks suggest that plants and animals diverged ca. ___ ___ years ago.
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1.6 billion
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LECTURE 2: Fossils
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Many important modern animal phyla left important fossils in _____ sediments.
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Cambrian
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LECTURE 2: Fossils
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What is a fossil?
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the preserved remains or traces of animals, plants, and other organisms from the remote past
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LAB 1
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What is a Stromatolite?
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the accretion of sediments by Cyanobacteria. These were once abundant in the Proterozoic but are now rare "living fossils"
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LECTURE 1
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What major types of fossils are used to help understand the history of life on earth?
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Body fossils and trace fossils (footprints, etc.)
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LAB 1
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Is every animal known today in the fossil record? Why or why not?
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No. There is bias in the fossil record for hard bodied animals.
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LAB 1
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Why did the "cambrian explosion" happen?
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This may have been due to an increase of Oxygen allowing for larger more complex organims.
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LAB 1
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The steps of Mitosis are...
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Prophase
Metaphase Anaphase Telophase and (Interphase) |
LECTURE 3
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