Animal Kingdom Quiz

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Questions and Answers

What is the estimated number of living animal species as of 2022?

  • 3.5 million
  • 1.5 million
  • 2.16 million (correct)
  • 4.2 million

Which clade includes animals with a bilaterally symmetric body plan?

  • Deuterostomes
  • Ediacaran biota
  • Protostomes
  • Bilateria (correct)

During which period did the Cambrian explosion, where many modern animal phyla became established, begin?

  • Around 539 million years ago (correct)
  • Around 10 million years ago
  • Around 1 billion years ago
  • Around 200 million years ago

What is the primary scientific study of animals known as?

<p>Zoology (A)</p> Signup and view all the answers

From what do animals grow during embryonic development?

<p>Hollow sphere of cells, the blastula (A)</p> Signup and view all the answers

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Study Notes

Animal Kingdom

  • Estimated 8.7 million identified living animal species as of 2022, with many more still undescribed.

Body Symmetry

  • Animals with bilaterally symmetric body plans belong to the clade Bilateria.

Evolutionary History

  • The Cambrian explosion, during which many modern animal phyla became established, began around 541 million years ago during the Cambrian period.

Zoology

  • The primary scientific study of animals is known as zoology.

Embryonic Development

  • Animals grow from three primary germ layers (ectoderm, endoderm, and mesoderm) during embryonic development.

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