What are chordates? What is the first known chordate fossil?
What are chordates? What is the first known chordate fossil?
Homework Answers
Dear Student,
Chordates are animals that belong to phylum chordata. They have four characteristic features: a notochord( a flexible structure found in the embryonic stage), dorsal hollow nerve chord(hollow tube like central nerve chords), pharyngeal slits(openings in the pharynx that are extended to the outside environment) and a post anal tail(external elongation of the body beyond the anus).
All these feature appear during some part of their lifetime.
The oldest known chordate fossil was found in China and it was described in the year 1995. It was a member of the species Yunnanozoon lividium. It is estimated to be 530 million years old.
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what was darwin first big idea? How does fossil
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Task 8 Identify the Class of Chordates? What order do they belong to? State an example...
Task 8 Identify the Class of Chordates? What order do they belong to? State an example for this order.
Chordate group characteristics Match the characteristic or picture on the left with the group on the right. ---Fishes - Amphibians Marine chordates with no skeleton Include marsupials, monotremes, and placentals Have a cranium but lack vertebrae Tunicates & lancelets -Nonavian reptiles Frog Hagfishes -Birds Turtle Shark Endothermic chordates with shelled, amniotic eggs Contains largest number of living vertebrate species - Cartilaginous fishes - Mammals Reset Mammal groups Click on all of the examples of placental mammals. Dolphin Opossum Platypus Bat...
what was darwin first big idea? How does fossil
evidence support this idea
7. Darwin first developed his Theory of Evolution in 1839, but did not publish his theory until 1859. Why did he wait so long to publish his book? What stimulated him to finally publish? ՍՍՍՍՍՍՍՍՍՍՍՍՍնն 8. What was Darwin's first "Big Idea? How does fossil evidence support this idea? 9. What was Darwin's second "Big Idea"? How does the presence of two color forms in the rock...
What conditions are best for fossil formation? Name organisms that are well represented in the fossil record Why are these types of organisms more prevalent in the fossil record? Discuss the following: Pangaea Laurasia Gondwana What organism is the major force driving evolution today?
Task 8 Identify the Class of Chordates? What order do they belong to? State an example for this order.
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