THE NATURE OF LIFE TIMELINE

Universidad Autónoma de Nuevo LeónPreparatoria 7 “Dr. Oscar Vela Cantú”Unidad PuentesThe Nature of life#2 Eduardo Armendariz Castro#7 Ángel Aaron Coronado García#10 Jorge Eduardo Espinosa Chavez#26 Renata Abigail Martínez Cavazos#43 Mauricio Tijerina Luna

1000-543 million years ago

2500-543 million years ago

4600 million years ago

4450-4000 million years ago

3800 million years ago.

4.5 billion years old.

THE NATURE OF LIFE

14,000 million years ago.

543-251 million years ago

THE NATURE OF LIFE

Evolution by Charles Darwin in 1859

251-65 million years ago

65 million years ago - present

María Teresa Valverde Valdés, Z. C. (2019). The Nature of life. Monterrey, Nuevo León, México: Training Distribution and Integrated Services.

The Earth is estimated to be about 4.5 billion years old, scientists believe that life appeared when the planet's environment was stable enough to sustain it. The earliest evidence of life on Earth comes from stromatolites (fossilized cyanobacteria) at about 3.4 billion years old.

Origin of life

A series of natural processes that contribute to transform the genetic characteristics of species in subsequent generations and take them to adapt constantly to the changing environmental conditions or to extinguish. It also refers to the separation of a specie into two or more, which leads to speciation.

Evolution

The first organisms were unicellular, anaerobic, and heterotrophic organisms born from the oceans of a primitive Earth; after them, photosynthetic organisms appeared.The life on Earth had originated in a primary atmosphere, different from our present atmosphere, which is rich in oxygen. It was obvious that oxygen had been produced by the photosynthetic activity of plants and maintained its constant concentration in the air thanks to this very active phenomenon.

Creation of the life on Earth

The presence of organic molecules in meteorites indicates that such compounds formed practically at the same time on Earth and in these bodies during the first stages of the formation of the Solar System.

Solar system

Proterozoic (paleoproterozoic)

Accumulation of gaseous oxygen in the atmosphere. The ozone layer is formed (2500- 2200). The first breathing organisms appear. An intense global glaciation takes place, called Snowball Earth (2200). First eukaryote cells appear (2150-2000). Endosymbiosis processes take place which give rise to some eukaryote organelles.

Supercontinent Pangaea fragments. Rise of plants with flowers and their associations of pollination with insects. At the end of the period takes place the extinction of large dinosaurs and large reptiles and other groups, possibly by a meteorite and intense volcanism

PhanerozoicMesozoic (cretaceous)

Proposed in 1927 by Georges Lemaitre, George Gamow, Ralph Alpher, and Robert Herman on 1948

This phenomenon that caused the expansion was a great explosion that occurred about 14,000 million years ago.

Theory

Big Bang

Separation of the lineage that gave rise to Animal and Fungi kingdoms. Most ancient fossil evidence of animals. A second period of Snowball Earth takes place (750). At the end of the period Ediacara fauna appeared, a kind of failed evolutive experiment of rare animals.

Proterozoic (Mesoproterozoic)

The Earth and the Solar System originated. The crust of the Earth was consolidated, its primitive, reducing and anoxic atmosphere was formed, and the first seas and lakes are formed. Fall of large meteorites. High temperatures, intense volcanism and the presence of condition not very conducive to life,

EONS (Hadean)

The supercontinent Pangaea is formed. Origin of dinosaurs. At the end of the period occurs the largest massive extinction in the history of life on Earth, due to a period of world volcanism. In the seas ammonites and brachiopods. At the end of the period mammalian reptiles originate.

Phanerozoic (Paleozoic)

Continents reach a configuration similar to the current one. Diversification of all mammal and bird orders. In Mexico, the south and southeast regions rise from the sea, as well as Central America, connecting North America and South America. Humid forest regions diminish; new biomes such as steppes, bushes and deserts appear. In these new conditions the lineage of large monkeys, which gives rise to the human family, appears. At the end of the period appears the mega-fauna of mammals

Phanerozoic (Cenozoic)