Here's a breakdown:
* Early observations: Ancient philosophers and alchemists speculated about the fundamental components of life, but lacked the tools to analyze them.
* 17th Century: Robert Hooke, using a microscope, observed cell walls in cork, giving us the concept of cells as fundamental units.
* 19th Century:
* Louis Pasteur disproved spontaneous generation, demonstrating that life arises from pre-existing life.
* Friedrich Wohler synthesized urea, a vital organic molecule, from inorganic materials, challenging the idea that organic molecules could only be produced by living organisms.
* Matthias Schleiden and Theodor Schwann formulated the cell theory, stating that all living organisms are composed of cells.
* 20th Century:
* The discovery of DNA's structure by Watson and Crick revolutionized our understanding of how genetic information is encoded and passed on.
* Advances in molecular biology further illuminated the fundamental building blocks of life, including the four major classes of biomolecules: carbohydrates, lipids, proteins, and nucleic acids.
Therefore, the understanding of the basic building blocks of life is a result of the cumulative efforts of many scientists across various disciplines and time periods.
