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Questions and Answers
What major event in Earth's history is associated with the diversification of insects?
What major event in Earth's history is associated with the diversification of insects?
- Changes in the CO2 concentration of the atmosphere
- The extinction of the dinosaurs
- The evolution of cartilaginous fish
- The appearance of the first land plants (correct)
Which group of animals is characterized by the calcification of an internal skeleton?
Which group of animals is characterized by the calcification of an internal skeleton?
- echinoderms (correct)
- brachiopods
- phoronids
- hemichordates
What is the primary method of movement used by the animal you observed in salt water?
What is the primary method of movement used by the animal you observed in salt water?
- Periodic jet of water (correct)
- Body undulation
- Cilia movement
- Fin movement
What is the approximate time period when insects underwent a significant diversification?
What is the approximate time period when insects underwent a significant diversification?
Which of the following groups is NOT characterized by the calcification of an internal skeleton?
Which of the following groups is NOT characterized by the calcification of an internal skeleton?
What is the environment in which the animal was observed using a periodic jet of water?
What is the environment in which the animal was observed using a periodic jet of water?
What characteristic of animals arose after the cnidarians?
What characteristic of animals arose after the cnidarians?
What is the most correct description of the ancestor of the animal clade?
What is the most correct description of the ancestor of the animal clade?
What is the main reason why J.B.S. Haldane said that the Creator has an inordinate fondness for beetles?
What is the main reason why J.B.S. Haldane said that the Creator has an inordinate fondness for beetles?
Which of the following is not a characteristic that arose after the cnidarians?
Which of the following is not a characteristic that arose after the cnidarians?
What is the characteristic that distinguishes animals from other multicellular organisms?
What is the characteristic that distinguishes animals from other multicellular organisms?
Which of the following is a possible ancestor of the animal clade?
Which of the following is a possible ancestor of the animal clade?
What characteristic is likely to identify an animal as a Cephalopod?
What characteristic is likely to identify an animal as a Cephalopod?
What problem is posed by the rigid exoskeleton of some ecdysozoans?
What problem is posed by the rigid exoskeleton of some ecdysozoans?
What is a characteristic of chordates that distinguishes them from other animals?
What is a characteristic of chordates that distinguishes them from other animals?
Which of the following is NOT a characteristic of ecdysozoans?
Which of the following is NOT a characteristic of ecdysozoans?
What is a possible advantage of having a rigid exoskeleton?
What is a possible advantage of having a rigid exoskeleton?
What is a characteristic of animals that have a lophophore?
What is a characteristic of animals that have a lophophore?
What is the characteristic feature of the organism that has a thick, chitinous cuticle, molts, has six jointed appendages, and a body that is divided into a head, thorax and abdomen?
What is the characteristic feature of the organism that has a thick, chitinous cuticle, molts, has six jointed appendages, and a body that is divided into a head, thorax and abdomen?
Which of the following organisms is not a member of the lophotrochozoan lineage?
Which of the following organisms is not a member of the lophotrochozoan lineage?
What is the characteristic feature of a choanoflagellate?
What is the characteristic feature of a choanoflagellate?
Which of the following organisms has a body that is divided into a head, thorax, and abdomen?
Which of the following organisms has a body that is divided into a head, thorax, and abdomen?
What is the characteristic feature of a nematode?
What is the characteristic feature of a nematode?
Which of the following is an example of a lophotrochozoan?
Which of the following is an example of a lophotrochozoan?
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Study Notes
Evolution of Insects and Chordates
- The diversification of insects about 450 million years ago corresponded with the appearance of the first land plants.
- The calcification of an internal skeleton is characteristic of echinoderms.
Characteristics of Animals
- In the history of animals, bilateral symmetry and three embryonic layers arose after the cnidarians.
- The ancestor of the animal clade was probably a choanoflagellate.
Beetles and Insects
- Most species of animals are beetles, which is why J.B.S. Haldane quipped "the Creator has an inordinate fondness for beetles."
- A rigid exoskeleton in some ecdysozoans has protective and supportive advantages but poses the problem of not being able to grow as the animal's body grows.
Chordates
- A major change in the evolutionary lineage leading to the chordates was the development of a dorsal hollow nerve cord.
- The ancestor of the chordates was probably a ciliated protist.
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