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Discover the Fascinating World of Animal Evolution

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Discover the Fascinating World of Animal Evolution

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Questions and Answers

What is the major difference between Parazoa and Eumetazoa?

Parazoa includes only sponges, while Eumetazoa includes animals with true tissues (correct)

Parazoa includes animals with bilateral symmetry, while Eumetazoa includes animals with radial symmetry

Parazoa includes animals with true tissues, while Eumetazoa includes only sponges

Parazoa includes animals with radial symmetry, while Eumetazoa includes animals with bilateral symmetry

Which group of animals is organized around a central axis and lacks well-developed muscles?

Radial animals (correct)

Parazoa

Bilateral animals

Eumetazoa

What is the probable ancestral organism of animals according to most zoologists?

Eumetazoa

Choanoflagellate (correct)

Bilateral animals

Porifera

What is the significance of the Parazoa-Eumetazoa split in the animal kingdom?

It marks the evolution of true tissues in some animals Signup and view all the answers

Which of the following is a characteristic of radial animals?

They are usually sessile Signup and view all the answers

What is the basis for constructing phylogenetic trees in zoology?

All of the above Signup and view all the answers

Which fossil site(s) support(s) the evidence of a tremendous radiation of animals at the beginning of the Cambrian period?

Both Greenland and the Yunnan region of China Signup and view all the answers

What were the ecological causes that may have sparked the Cambrian Explosion?

Changes in predator-prey relationships and protective shells Signup and view all the answers

What is the significance of the Cambrian Explosion?

It was a time of tremendous radiation of animals with hard, mineralized skeletons Signup and view all the answers