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How are paleozoic placoid scales of shark different from paleoniscoid scales of modern sharks?
Placoid Scale of paleozoic sharks - had pulp cavity, basal canal and neck canal. Also had evolved and an enameloid layer covered the dentine.
Paleoniscoid scales of modern shark - have lost the layer of vascular bone but retained the dentinous layer and laminated bony layer. Also have thick ganoid layyer.
What else can I help you with?
Modern squids descended from what type of early Paleozoic organisms?
trilobites.
Did any Paleozoic Era animal life survive?
Yes. If no animals survived from the Paleozoic into the mesozoic, then there would be no animals today.
During which geologic era did most of the modern day mountain ranges found in northeastern North America form?
The Paleozoic Era
What era are fish in?
Fish are animals that have been around for millions of years and are currently part of the modern era, known as the Cenozoic era. They have evolved and adapted over time to inhabit a wide variety of aquatic environments around the world.
What are the four historical periods of astronomy?
Mesozoic, paleolithic, paleozoic, cretaceous
When did sharks appear?
Pliocene there were also a few other species around at the time some of them bigger than the modern great white.
What is the different art movements of the modern era?
Different dramatic movement in modern drama
What are the modern treatment for different diseases?
the modern treatment to different diseases are apple juice
What paleoclimatic evidence supports the idea of the late Paleozoic super continent in the Southern Hemisphere?
fossil evidence - identical fossils in different continentrock type and structural similarities - found similar rocks on continents on opposite sidesstudy of climate - the heat of the sunRead more: What_evidence_is_there_to_support_the_existence_of_a_super_continent
Can modern warfare connect to modern warfare 2?
No they are different games
Had syncretism not occurred in the Americas how might modern culture be different?
Had syncretism not occurred in the Americas, the modern culture would be different because of the different religious beliefs.
How are ancient Olympics different to modern Olympics?
ones ancient ones modern
