Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

30. Overview of Animals

Overview of Animals

General Biology

30. Overview of Animals

Overview of Animals

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1:58 minutes

Problem 2

Textbook Question

In a tube-within-a-tube body plan, what is the interior tube derived from?
a. Ectoderm
b. Mesoderm
c. The coelom
d. Endoderm

Verified step by step guidance

Understand the concept of a tube-within-a-tube body plan, which is a common structural organization in animals where the body is organized into two main tubes: an outer body wall and an inner digestive tract.

Identify the germ layers formed during embryonic development: ectoderm, mesoderm, and endoderm. Each layer gives rise to different tissues and organs in the body.

Recall that the endoderm is the innermost germ layer and is responsible for forming the lining of the digestive tract and associated structures.

Recognize that in the tube-within-a-tube body plan, the interior tube, which is the digestive tract, is derived from the endoderm.

Conclude that the correct answer to the problem is that the interior tube is derived from the endoderm.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Tube-within-a-tube body plan

The tube-within-a-tube body plan is a fundamental structural organization in many animals, where the body consists of an outer tube (body wall) and an inner tube (digestive tract). This arrangement allows for efficient digestion and nutrient absorption, and is characteristic of bilaterally symmetrical organisms, including humans.

Endoderm

The endoderm is one of the three primary germ layers formed during embryonic development. It is the innermost layer and gives rise to the interior linings of the digestive and respiratory systems, including the gut tube. Understanding the role of the endoderm is crucial for identifying the origin of the inner tube in the tube-within-a-tube body plan.

Embryonic germ layers

Embryonic germ layers are the three layers formed during early embryogenesis: ectoderm, mesoderm, and endoderm. Each layer differentiates into specific tissues and organs. The ectoderm forms the skin and nervous system, the mesoderm forms muscles and the circulatory system, and the endoderm forms the digestive and respiratory systems. Recognizing these layers helps in understanding the development of body structures.

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Related Practice

Textbook Question

The table below lists the common names of the nine animal phyla surveyed in this chapter. For each phylum, list the key characteristics and some representatives.

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