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Related Flashcards
Cards In This Set
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When did the Neoproterozoic era occur?
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Confused
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In the Neoproterozoic era where was there an increase in animal diversity?
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565 - 550 million years ago
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When did the Paleozoic Era occur? and what specifically happened within the Paleozoic era?
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542-251 million years ago Cambrian explosion
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What did the Cambrian Explosion contribute?
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Huge increase in animal diversity (535 - 525 million years ago) Half of all current animals species descended from here
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What hypothesis associated with the Cambrian explosion?
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1. Change in predatory prey relationship2. Rise in atmospheric oxygen resulted in animals having larger metabolism than an increase in body size3. Evolution of Hox genes-> flexibility in development 4. all of the above
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Describe post Cambrian Period
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Mass extinction Fishes became dominant predator460 million years ago-> land colonization360 milllion years ago amphibians amniotesmillipedes, centipedesFern galls cavities in plants in response to insects 302 million years ago
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When did the Mesozoic era occur? explain attribute
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No new animal groupNiche Specialization Coral reef esablished as new ecosystem Some reptiles return to aquatic habitats Wings and flight (Birds and Pterasaurs) Large and small dinsaurs First mammals (small insect eaters) Diversification of flowering plants and insects
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When did the Cenozoic era occur? attributes?
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Extinction (dinosaurs) Rise of larger mammals (herbivores and Carnivores)
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Describe Radial and Bilateral Symmetry
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Radial: No front, back, left, or rightBilateral: Left and right, top and bottom,(dorsal, ventral) front and back (anterior posterior)
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What is cephalization
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Concentration of nervous system at anterior (brain censsory organs) ...head
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What is tissue?
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Specialized cells segregated from other cells
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What is sessil
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Living attached to a substrate
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What is Planktonic?
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Drifting or weakly swimming Ex. Jellies
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