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Questions and Answers
What is the estimated number of living animal species as of 2022?
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?
Which clade includes animals with a bilaterally symmetric body plan?
- Cnidaria
- Acoelomorpha
- Radiata
- Bilateria (correct)
During which geological period did the Cambrian explosion begin?
During which geological period did the Cambrian explosion begin?
- 300 million years ago
- 200 million years ago
- 539 million years ago (correct)
- 700 million years ago
Which group contains animals such as nematodes, arthropods, flatworms, annelids, and molluscs?
Which group contains animals such as nematodes, arthropods, flatworms, annelids, and molluscs?
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What is the size range of animals mentioned in the text?
What is the size range of animals mentioned in the text?
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