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Cambrian period is one of the Paleozoic period, living things developed hard shells and exoskeletons formed the . During the Cambrian . These hard structures such as . Trilobites were members of the phyla and were dominant animal group during Cambrian. Archaeologists are reefs-building Archaeologists, an extinct group of sponges dominated the reefs of The Burgess Shale Fauna: Snapshot of the Cambrian World The Canadian rocks with rare and exquisitely deposit of fossils are known . Walcott, an American Paleontologist discovered over 50,000 in the Burgess Shale. Modern studies reported approximately 125

The oldest representative of the phylum One of the most common Burgess animals was the Marcela with Jointed appendages. The delicate looking arthropod Marcela are referred to as “lace Along with Marcela and other arthropod trilobites have hard The Ordaining Ordaining period was characterized by diversification among the During the Ordaining period certain green algae moved towards the Bryozoans are a group tot organisms sometimes known as “moss Brainchild shells are among the most common marine fossils in Paleozoic Barbershops that were present during Cambrian period underwent an adaptive .

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Over one hundred families of marine disappeared to known as pave way for an adaptive radiation. The oldest group of astronomer first appeared during the Cambrian period. The Sicilian The Sicilian period was when eukaryotic life colonized terrestrial The fish underwent an adaptive The Crinoids fossil consist of three body parts; hold-fast, stalk, and . One arthropod group that became more diverse during Sicilian and Devotion times was . Placeholders were the oldest Jawed During Sicilian fish established themselves in both marine and _-water.

Colonization of land began with plant, then insects and . The process of occurs when an organism develops water conserving mechanism when removed from water. Gas exchange is the mode by which organisms in the water exchange carbon dioxide and gases on the surface. Reproduction is when the organisms in the water can release their gametes in the . Organisms living in water are supported by dense The process by which single celled organisms move material in, out and within their cells is called Plants Invade the Land Plants are divided into two large groups, vascular plants and _plants.

A typical vascular plant is Vascular plants developed during the _period. The non-vascular plants have no plants have no root, leaves, conducting cells. The earliest vascular or flowers. The Devotion: Rise of the Amphibians Diversification of vertebrates, fish, and forest plants continued through the _period. The first terrestrial vertebrate during Devotion period was . One of the top predators in the Devotion seas was a 3-foot Barbershops continued to diversify in the The Spiffier produced shells with elongated Devotion Marine Vertebrates sea.

Diversity tot this group evolved during the Devotion period, hence, it was called t “Age of the . ” Small Jailers, and finales ostracism’s were the earliest . The first Jawed fish were the Examples of evolutionary modification of the gill arches are predator fish with powerful Jaws were; cartilaginous fish and corticosteroids fish are ancestors of Devotion Plants Continued Ferns are plants that reproduce by . The two fish. The Ferns and saprophytes are similar anatomically, hence, it was suggested that they both shared a common forming . Electioneering belong to the groups of seed

These groups of plants (Electioneering) produce seeds but no studies suggested that the amphibians must have descended from . Molecular . Near the end of Devotion period another mass extinction occurred with major adverse impact on creatures. It was suggested that the Devotion extinction could be an asteroid impact caused by the global The Carboniferous: Coal Swamp and Glaciers Carboniferous was named for the widespread coal America. The carboniferous forest produced a lot of found in Europe and North When biomass’s are buried, they turned into large deposit of .

Coal is itinerary rock which is composed of plant early carboniferous is often called the ” deposited in the swamp. The of crinoids. ” Sharks and bony fish continued to diversify during the good period of early carboniferous lead to mass reduction in The Permian: Preclude to crisis During the Permian period Pangaea completed its . The late . The Permian ended the mass and ushered in the emergence of new groups of . The amenities were the very first truly terrestrial did not have any need to return to water to lay . Amenities will have to return to the water to lay eggs and reproduce.

The Permian Era saw an increased spread of conifers and cycad, two major groups of of the world before flowering plants evolved. T n e Great Permian Extinction During the Permian extinction, over 95% of marine species were % of terrestrial taxonomic families. The main cause of the compared to Extinction remained unresolved. Possible causes of this extinction were lava flow, climatic resulting in glaciations, poisoning of the formation of Pangaea and cretaceous tertiary extinction. Regardless of the cause or causes of this extinction, this was a devastating crisis for

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