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Questions and Answers
Which clade contains animals with a bilaterally symmetric body plan?
Which clade contains animals with a bilaterally symmetric body plan?
- Arthropods
- Molluscs
- Bilateria (correct)
- Protostomes
What is the estimated number of living animal species as of 2022?
What is the estimated number of living animal species as of 2022?
- 2.16 million
- 7.77 million (correct)
- 85,000
- 1.05 million
What is the range in length of animals mentioned in the text?
What is the range in length of animals mentioned in the text?
- 0.00033 in to 110 ft
- 0.00033 cm to 110 m
- 8.5 micrometres to 33.6 metres (correct)
- 8.5 mm to 33.6 km
What is the term for the scientific study of animals?
What is the term for the scientific study of animals?
What is the biological kingdom to which animals belong?
What is the biological kingdom to which animals belong?
Which of the following is NOT a characteristic of animals?
Which of the following is NOT a characteristic of animals?
What is the approximate number of described insect species as of 2022?
What is the approximate number of described insect species as of 2022?
Which group is NOT included in the Bilateria clade?
Which group is NOT included in the Bilateria clade?
What is the term for the hollow sphere of cells from which animals grow during embryonic development?
What is the term for the hollow sphere of cells from which animals grow during embryonic development?
Which of the following is NOT a member of the protostomes group?
Which of the following is NOT a member of the protostomes group?
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Study Notes
Animal Characteristics
- Animals have a bilaterally symmetric body plan, which is a characteristic of the Bilateria clade.
Animal Diversity
- As of 2022, there are an estimated 8.7 million living animal species.
- The range in length of animals varies greatly, from 0.2 millimeters to 33 meters.
- Insects are a significant part of animal diversity, with approximately 1.3 million described species as of 2022.
Biological Classification
- Animals belong to the biological kingdom Animalia.
- The scientific study of animals is known as Zoology.
Exceptional Cases
- Echinoderms, such as starfish and sea urchins, are NOT included in the Bilateria clade.
- Plants are NOT characteristic of animals, as they are autotrophic and lack the ability to move.
- Brachiopods are NOT members of the protostomes group.
Developmental Biology
- The blastula is the term for the hollow sphere of cells from which animals grow during embryonic development.
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