Taxonomy: .

Swedish Naturalist, Carolus Linnaeus, in 1758 had two kingdoms, animal and vegetable.

Current taxonomy is:

Plant vs Animal: Plants and animals differ in many ways, including their cells, food sources, and movement:
Plant cells have cell walls made of cellulose, which provide structural support and give plant cells their rectangular shape. Animal cells do not have cell walls.
Plants can make their own food using energy from sunlight through photosynthesis. Animals must eat plants or other animals to get organic molecules
Animals are heterotrophs, so they must eat plants or other animals to get organic molecules.

• Earth formed 4.6 Billion Years Ago (BYA)
• DNA - 3.7 and 4.4 BYA. Scientists think that individual nucleotides may have formed spontaneously in the chaotic soup that was simmering on the primordial earth.
  See Origin of life -- a prebiotic route to DNA. | eurekalert.org
• Oceans - 3.8 BYA - The earth cooled enough for water vapor to condense forming the oceans.
• Phototrophic Bacteria 3.6 BTA
• Microbes: The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years ago (BYA).
  Microbes are just single cells with no organelles and no nuclei to package their DNA.
• The Great Oxidation Event (GOE). When Cyanobacteria evolved at least 2.4 billion years ago (BYA), they set the stage for a remarkable transformation. They became Earth’s first photo-synthesizers, making food using water and the Sun’s energy, and releasing oxygen as a result.
• Something revolutionary happened as microbes began living inside other microbes, . Mitochondria, that process food into energy, evolved from these mutually beneficial relationships.
• Eukaryotes - 1.8 BYA -Single or multi-celled organisms with a cell nucleus.
  The Eukaryota include the organisms that most people are most familiar with - all animals, plants, fungi, and protists.
• Snowball Earth. A hypothesis that 650 Million years ago (MYA) the planet's surface became nearly entirely frozen with no liquid oceanic or surface water exposed to the atmosphere.
• Earliest complex multicellular life 1 BYA
  In 2021, scientists reported on the discovery of new microfossils in ancient Scottish lake sediments that could help fill in the gap between the earliest single-celled life and multicellular life.
  It Answers Darwins Dilema - The lack of a rich fossil record predating the rise of shelly invertebrates that marks the beginning of the Cambrian Period of geologic time (≈550 million years ago),
• Cambrian Esplosion 539 MYA
  In perhaps as few as 10 million years, marine animals evolved most of the basic body forms that we observe in modern groups.

Books:
"Big History", Cynthia Brown
"Maps of Time", by David Christian