Evolution of Life on Earth

#EVOLUTION_OF_LIFE_ON_EARTH
#মালেমদা_তাইবং_পুন্সি_সিং_হৌরকঙৈগি_তাংককসিং

#The_BIG_BANG_created_the_Universe approximately 13.78 billion years ago and formed space and time. The solar system was formed about 4.57 billion years ago, with planetary systems and Moons. In its 4.57 billion years circling the Sun, the Earth, being at Sun’s #GOLDILOCKS_ZONE, has harbored an increasing diversity of life forms with the #TIMELINE
1. For the last 3.6 billion years, simple cells (#Prokaryotes);
2. For the last 3.4 billion years, #Cyanobacteria performing photosynthesis;
3. For the last 2 billion years, complex cells (#Eukaryotes);
4. For the last 1.2 billion years, #Eukaryotes which sexually reproduce;
5. For the last 1 billion years, #Multicellular_life;
6. For the last 600 million years, #Simple_animals;
7. For the last 550 million years, #Bilaterians, water life forms with a front and a back;
8. For the last 500 million years, #Fish and proto-amphibians;
9. For the last 475 million years, #Land plants;
10. For the last 400 million years, #Insects and seeds;
11. For the last 360 million years, #Amphibians;
12. For the last 300 million years, #Reptiles;
13. For the last 200 million years, #Mammals;
14. For the last 150 million years, #Birds;
15. For the last 130 million years, #Flowers;
16. For the last 60 million years, the #Primates,
17. For the last 20 million years, the family #Hominidae (great apes);
18. For the last 2.5 million years, the genus #Homo (including humans and their predecessors);
19. for the last 200,000 years, anatomically #Modern_Humans

#Thus_modern_humans_evolved_on_Earth_about 200,000 years ago and may continue on Earth for another 4.5 billion years till the death of the Sun - #THE_DOOMS_DAY!!!

By

Raghu Ningthoujam
Scientist (ISRO)