Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

1. A Review of General Chemistry

Intro to Organic Chemistry

Organic Chemistry

1. A Review of General Chemistry

Intro to Organic Chemistry

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Multiple Choice

Which of the following statements best explains how fossils provide evidence that species may be changing over time?

Fossils are identical to modern species, indicating no change over time.

Fossils show a progression of species with slight modifications over time.

Fossils only show extinct species, not changes in existing ones.

Fossils are randomly distributed and do not show any pattern of change.

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Verified step by step guidance

Understand the role of fossils in studying evolutionary biology. Fossils are the preserved remains or traces of organisms from the past, found in sedimentary rock layers.

Recognize that fossils provide a historical record of life on Earth, allowing scientists to trace the development and changes in species over time.

Identify that the progression of fossils in different geological layers can show gradual changes in species, supporting the theory of evolution.

Consider that fossils can show transitional forms, which are species that exhibit traits common to both an ancestral group and its derived descendant group, indicating evolutionary change.

Conclude that the statement 'Fossils show a progression of species with slight modifications over time' best explains how fossils provide evidence of species changing over time, as it aligns with the concept of gradual evolutionary change.