Dates and Times
organisms
land plants
Fish and amphibians
100
When did the Paleozoic Era begin?
542 million years ago
100
During the Cambrian explosion for the first time organisms had.........?
Hard shells
100
What was one major example of a land plant?
a Fern
100
What were more common? A. Vertebrates B. invertebrates
B. invertebrates
200
251 million years ago
When did the Paleozoic era end?
200
What is a Invertebrate?
A creature with no back bone or spine
200
In what period did land plants begin to grow?
The Silurian period
200
During what period did the animals start spreading on to the land?
Devonian period
300
How long did the Paleozoic era last?
291 million years long
300
What are 3 examples of Invertebrates?
Jellyfish, Worms, and Sponges
300
When did plants start to grow in drier areas rather than damper areas?
The Devonian period
300
What was the first land vertebrate?
Lungfish
400
Which period was the shortest A.Cambrian B.Ordovician C.Silurian D.Devonian E.Carboniferous F.Permian
C. Silurian
400
What is a Brachiopod?
a clam like creature
400
When did the ferns start evolving into bigger ferns?
Carboniferous period
400
Do amphibians live on land or water more?
Neither they live on land half the time and water half the time
500
Which period was the longest? A.Cambrian B.Ordovician C.Silurian D.Devonian E.Carboniferous F.Permian
D.Devonian
500
What are Trilobites?
organisms with jointed legs and and lots of body segments
500
What evolved after the large ferns?
Coal forests
500
What did most fishes have?
Jaws, Bony skeletons, and Scales
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