Phylum Cordata

What is the approximate number of species in the phylum Chordata?

• Over 30,000 species

• Over 60,000 species

• Over 80,000 species

• Over 100,000 species

Which of the following is NOT a characteristic of chordates?

• Bilateral symmetry

• Presence of a coelom

• Radial symmetry

• Segmented body

During which stage do all four characteristic traits of chordates appear?

• Adult stage

• Embryonic stage

• Juvenile stage

• Larval stage

Which subphylum of Chordata includes species that have a backbone?

• Vertebrata

• Urochordata

• Cephalochordata

• Echinodermata

Which group of animals are known as ectotherms?

• Mammals

• Birds

• Fish and reptiles and amphibians

What unique feature do vertebrate chordates have?

• A notochord

• A dorsal hollow nerve cord

• A backbone and an endoskeleton

• All of the above

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How do endotherms regulate their body temperature?

• By changing their external environment

• By generating internal body heat

• By moving to different locations

• By altering their skin color

What evolutionary adaptation do most vertebrates have for oxygen intake?

• Lungs

• Gills

• Both A and B

• Notochord

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Approximately how many years ago did vertebrates evolve?

• 530 million years ago

• 200 million years ago

• 1 billion years ago

• 700 million years ago

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Where were the first known vertebrate fossils found?

• Chengjiang locality in China

• Siberia in Russia

• Sahara Desert in Africa

• Amazon Rainforest in Brazil

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