Questions and Answers
What is the estimated number of living animal species as of 2022?
2.16 million
Which clade includes animals with a bilaterally symmetric body plan?
Bilateria
During which period did the Cambrian explosion, where many modern animal phyla became established, begin?
Around 539 million years ago
What is the primary scientific study of animals known as?
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From what do animals grow during embryonic development?
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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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