timeline of evolution

Earliest Life on Earth

1 CE

It was called the prokaryotic Archaea 3.8-4.2 billion years ago

Earliest Atmospheric Oxygen

2

Present at low levels 3.4 Billion years ago

Earliest Multicellular Life

3

Cell-to-cell signilling and coordinated responses 2.1 billion years ago

Earliest Multicellular Life With Sexual Reprodive (Meiosis)

4

Meiosis and recombination become prevelent in life, in the proterozoiz eon. 1.45 billion years ago. One of the main reasons that it can be speculated that this process has occurred is due to the modern natural urge to reproduce and repopulate to keep species healthy

Earliest Animals amoung the prokaryotes

5

Animals such as worms and jellyfish were created prior to the first world wide extinction event, the global glaciation. 800 million years ago.

Earliest chordates amongst deuterostomes

6

adaptations of the animals that have been created allowing them to breath better underwater with the creation of pharyngeal gil slits and better development patterns for more intelligent lifeforms 535 million years ago. these adaptations were created due to an almost 100% aquatic lifestyle on earth at this point and the creatures living here needed a way to better survive and adapt to their surroundings.

Vertebrates

7

emergence of vertebrates amongst the chordates. Aquatic animals with mineralised skeletons, armour and scales were created around 480 million years ago. Life up until this point consisted of worm like creatures and jellyfish. A reason that can be speculated for the evolution of backbones and Mineralised skeletons is to escape predators that were prior to this, to fast to evade but the adaptation of a skeleton makes it a lot easier to manoeuvre through the aquatic environment

Mass extinction

8

A mass extinction occurred around 445 million years ago spanning the time of about 1 million years, wiping out about three quarters of the population of earth. Occurred in the late Ordovician period

Tetrapod's

9

Earlies tetrapod's amongst the Vertebrae population, limbs replacing fins. Still fully aquatic at this time, occurring around 394 million years ago. Much the same as the reason for a vertebrate evolution, limbs make the creature that adapts them a lot faster compared to the comparable animals. Along with this, limbs create the perfect pathway to Terrestrial life.

Earliest land vertebrae's

10

the earliest land vertebrae's were emerging from the water around 350 million years ago, while still being semi-aquatic this may have been due to the mass of predators arising in the waters so nature had to find a way to survive as best it could. this occurred in the early Carboniferous period

Earliest fully terrestrial tetrapod vertebrae's

11

These tetrapod vertebrae's were also the first to start laying eggs in the Early carboniferous period around 340 million years ago. After evolving to be able to survive to a degree on land, the population on land had probably realised how much easier life was on solid land so they decided to stay and repopulate

Largest extinction event

12

Around 251.9 million years ago the largest extinction event occurred, wiping out around ninety percent of the worlds population. Caused by volcanic eruptions of CO2 and ash. this event occurred during the Permian-Triassic transition

Dawn of the modern world

13

Around 233 million years ago the diversity of the worlds surviving species seemed to "explode" over the next couple million years, increasing the biodiversity of the planet, leading directly into the creation of Insects, Dinosaurs, Reptiles and stem mammals while this cannot really be defined with a specific reason it can be said that while life on land got stronger and more difficult the animals their evolved to survive, same as in water.

Mass extinction event another one :(

14

Around 201.3 million years ago, Volcanic eruptions coupled with CO2 emissions equivalent of those projected for the 21st century combined wiped out around two thirds of the population of the world.

"True" mammals

15

around 178 million years ago the world started to re-diversify again giving way to what we now label as "true" mammals which are endothermic and fur covered versions of terrestrial vertebrae covering the world. this adaptation happened around the global glaciation so the average world temperature would have plummeted.

Another mass extinction, surely this is the last one?

16

Around 66 million years ago, an abrupt extinction of around three quarters of the worlds population (not including areal classified animals) were wiped out due to an asteroid impact in what is now known as Chicxulub, Mexico. this happened in the Cretaceous-Paleogene transition.

Earliest MONKE

17

Around 55 million years ago there was the creation of the earliest primates amongst the mammal dominated society.

Old world or new world?

18

around 44 million years ago is when scientists say that there was the emergence of the "new world" with the development of colour vision, opposable thumbs and sociality.

earliest REAL MONKE

19

Earliest Hominoids (apes) amongst the old world primates. they had no tail, an enlarged brain and were able to create vowel sounds, these vowels are classed as the "dawn of speech for humanity"

earliest bipedal ancestors

20

from 7 to 3 million years ago the worlds continents exploded with different evolutionary variations of the "new world" primates, they grew larger in Spain and Kenya, had Bipedal capabilities in Africa and eventually became known as the Australopithecus or the first ancestors of modern humans.

earlies tools?

21

around 3.3 million years ago the first sharpened and modified stone artefacts were found in Kenya and dubbed the "Lomekwian tools" this meant that humanity was displaying technological behaviours.