Term
| Oldest fossils of multicellulars are |
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Definition
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Definition
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Term
What is the oldest fossil?
How old is it?
how big/ small is it? |
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Definition
- sponge
-760 Mya
- size of grain of sand |
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Term
Snow ball earth hypothesis is A.K.A?
how long did it last?
what is the result of this? |
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Definition
- sever ice age that covered from pole to pole
-750-570 Mya
- caused a hold on evolution of animals for about 200 million years |
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Term
| When did larger, soft-bodies animals appear? |
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Definition
Proterozoic Period
570 Million years ago |
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Term
| How did the animals represent a different evaluational organism? |
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Definition
| Motile; heterotrophs; no cell wall |
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Term
| The late larger, soft-bodies animals in the late Proterozoic period were what? |
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Definition
Herbivores
which fed on algae
NO CARNIVORES @ THIS POINT |
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Term
The Cambrian period was when?
How did it start?
Physical results of this period? |
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Definition
- 540 ~ 485 Mya
- started with an explosion of new animal species
-exoskeletons & better mobility |
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Term
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Definition
allowed evolution of new body plans
controls body plans & Appendages (part of an invertebrate) |
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Term
| Most common Burgess fossil |
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Definition
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Term
Invertebrates are the 1st to ____ ?
Have no what? |
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Definition
1st to evolve
have no backbone |
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Definition
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Term
| Songs are the first what? |
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Definition
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Term
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Definition
| symmetry, tissues, or organs |
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Definition
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Term
| Name the physical characteristics of the Cnidaria |
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Definition
radial symmetry, nerve net & muscle
epithelium, sacklike gut |
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Term
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Definition
Flatworms (i.e -tapeworms)
bilateral symmetry
has organs
1st w/ cephalization & bilateral nerve cord |
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Term
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Definition
roundworms (pinworms, heart-worms, Loa loa)
1st with tube digestive system |
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Term
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Definition
clams, squids, octopi
1st with advanced body cavity |
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Definition
earthworms, leeches
1st with segmentation & closed circulatory system |
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Term
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Definition
spiders, insects, crustaceans
greatest # spp of any anima
hard exoskeleton, jointed appendages |
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Term
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Definition
| notochord, nerve cord, pharynx & tail |
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Term
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Definition
| supporting rod along body |
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Definition
| muscular feeding apparatus at beginning of digestive tube |
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Term
| chordate ancestors arose in |
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