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

21. Evolution

Evidence of Evolution

General Biology

21. Evolution

Evidence of Evolution

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Multiple Choice

All of these examples show evidence for evolution because they demonstrate which of the following?

Environmental stability and lack of change

Descent with modification and common ancestry

Random mutation and genetic drift only

Artificial selection and domestication

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Understand the concept of evolution: Evolution refers to the process by which species change over time through mechanisms such as natural selection, genetic drift, mutation, and gene flow. A key aspect of evolution is 'descent with modification,' which means that species share a common ancestor but have diverged over time due to changes in their genetic makeup.

Analyze the options provided: The first option, 'Environmental stability and lack of change,' does not align with the concept of evolution, as evolution inherently involves change over time. The second option, 'Descent with modification and common ancestry,' directly reflects the core principles of evolution. The third option, 'Random mutation and genetic drift only,' is incomplete because evolution involves additional mechanisms like natural selection. The fourth option, 'Artificial selection and domestication,' is a human-driven process and not a comprehensive explanation of natural evolutionary evidence.

Focus on the correct concept: 'Descent with modification and common ancestry' is the most accurate description of the evidence for evolution. This concept explains how species can share a common ancestor and yet exhibit differences due to modifications over generations.

Relate to examples of evidence: Examples of evidence for evolution include homologous structures (similar anatomical features in different species due to common ancestry), fossil records (showing gradual changes over time), and molecular evidence (similarities in DNA sequences among species). These all support the idea of descent with modification and common ancestry.

Conclude the reasoning: Based on the analysis, the correct answer is 'Descent with modification and common ancestry,' as it encapsulates the fundamental principles of evolution and is supported by various lines of evidence.

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