By: Morgan Bert/ Bio 30
4.5 Billion BCE
The Origin of Earth
Scientist have calculated an approximation of Earth's age through deciphering the ages of rocks. Specifically the radioactive elements that occur naturally within minerals and rocks allow accurate measurements.
3.8 Billion BCE
The First Organism
The first organism on Earth was believed to be a prokaryotic cell, such as bacteria. Scientists have also concluded that DNA & RNA were present within these primitive organisms.
3.4 Billion BCE
The Birth of Photosynthesis
The first organism capable of photosynthesis used the near-infrared opposed to visible light to provide their own nutrients.
3.0 Billion BCE
Multi cellular Organisms
These organisms evolved from simpler organisms and caused a drastic shift in the ecosystem.
The first appearance of a multi-celled organism is from a cyanobacteria-like organism.
2.7 Billion BCE
First Cell with a Nucleus
These cells are much more complex. The nucleus contains the genetic information of the organism.
1.5 Billion BCE
Mitochondria and Chloroplast
The mitochondria is the power house of the cell. Chloroplast converts light energy into sugars within a plant cell. Multiple theories exist regarding how the mitochondria and chloroplast came to be; however, multiple theories agree that it likely involved an anaerobic organism.
1.2 Billion BCE
All sexually reproducing eukaryota organisms likely derive from a common ancestor. This resulted in massive evolutionary progress.
Naming of the Cell
Robert Hooke named the "cell" after observation under a microscope. He decided that a dead plant cell resembled the cellula or small rooms occupied by monks.
Cells Make up Plants
Matthias Schielden observed plant cells and stated that all plants were composed of cells. A massive breakthrough which contributed to biology and cell theory.
Cells Make up Animals
Theodor Schwann studied animals and deciphered that animal tissue was composed of cells. Therefore, proving that animals are composed of cells just like plants.
Charles Darwin published his theory of evolution through his book On the Origin of Species. He established that all species have descended over time from a common ancestor, and new species occurred from natural selection.
The Structure of DNA
Francis Crick and James Watson are credited with creating the first model of DNA, the double-helix. Their model explains how DNA is encoded and transfers to offspring.