Early humans and their lifestyle

Introduction 

The transition from primitive humans to modern humans involved various modifications. Throughout this process, several human lifestyles were observed. They transitioned from being food gatherers to producers. They made numerous discoveries that are still in use in modified form. They then started to create shelters for a prolonged stay in a particular location as farming advanced. They are thought to have originated in Africa and then gradually spread to other regions of the world. These people initially lived in tiny groupings but over time shifted to bigger groups. With that, the concept of villages was developed and cultural adaption became simpler.

Lifestyle and Culture of early modern humans

  • In the beginning, humans were hunter-gatherers. They moved around extensively and used stone weapons to hunt wild animals and obtain harvest from trees.
  • To protect themselves from the harsh weather, they used to cover themselves in either animal skins or leaves or bark of trees.
  • As they progressed, they discovered fire and learned to use it for many things.
  • Early modern humans shifted toward farming as the climate on earth warmed up.
  • Some of these humans were engaged in heavy hunting, while others were in the early stages of domestication.
  • Early modern people raised crops like corn, wheat, and barley and became food producers.
  • The notions of family and community also emerged when these humans  began residing in small communities. In turn, villages were established for safety and cooperation of the people.This image shows the way early humans lived. They used fire for food, hunted animals and various tools for hunting purposes.

Population Trends Beginning About 100,000 Years Ago

  • Researchers and historians have estimated that early modern humans, or Homo sapiens, originated in various parts of Africa between 200,000 and 100,000 years ago.
  • For many years, these modern humans continued to produce crude, primitive stone tools, just like their ancestors.
  • According to scientific studies, there was a gap period between, when people start to look modern and when they start behaving modern.
  • Stephen Shennan, an archaeologist at London University, believes that cultural change is what allowed humans to socialize and begin residing in large groupings. This paved the road for their modernization.
  • Population growth in Africa made it simpler for people to establish connections with nearby communities. Most likely, they switched partners for mating. This ultimately resulted in the exchange of ideas and genetic material which paved way for newer creations and inventions.
  • Homo sapiens first migrated from Africa to Europe some 45,000 years ago.
  • Neanderthals were already present in Europe when modern people first arrived. They outnumbered their rival Neanderthals and eliminated them from Europe.
  • The population started to drop around 25,000 years ago, during the Ice Age, when the ice almost completely cover the northern Europe. However, when this era came to a conclusion, the population once more increased.
  • With the introduction of farming and established life 11,000 years ago, female fertility also increased. As a result, the population reached up to 6 to 7 million on the beginning of the Neolithic period.

Early Modern Man Society

  • Modern humans initially preferred to remain in small groups, but they gradually began to form big groups as a result of mutual ties.
  • In these groups, everyone had access to resources like food and tools.
  • During that time, there was still no sense of personal or individual control and hence they used to be a danger to other groups.
  • When the large groups of humans divided themselves into villages, all of these things started to change. They  became more sophisticated, and gradually the idea of the family also emerged.

Summary

Numerous studies have been conducted to examine- the way of life, culture, and population growth of early modern humans. Early modern people began to adapt to various habitats and surroundings as they began to spread across the globe. A variety of lifestyles could be observed as a result of the shifting climate and farming activities.

They developed farming habits and cultivated various crops for food and nutrition. People stayed in the area longer as a result of these farming activites. This caused a transition from a nomadic to a settled lifestyle. Also the concept of family and community developed during this era.

Frequently Asked Questions

Which is the World’s Oldest “Village”?
Ans: The Mladec caverns are located in the Prague region of the Czech Republic is regarded as the world’s  oldest “village” . Many early modern human skeletons or remains can be found in these caves. The bones discovered here were 31,000 years old.

Researchers attempted to study the DNA of these fossils but were unable in doing so. They did, however, manage to analyse the DNA of two specimens and discovered that those did not belong to the “homo” series.

2. When and what is the reason of human population explosion which occured 60,000-80,000 years ago?
Ans: According to several archaeological studies, the Neolithic era is responsible for the expansion of the human population. In this period the change to domestication led to the development of more sophisticated procedures of agriculture and settlements, opening the path for population rise from 4-5 million to 60-70 million. But. according to a study from the University of Paris, population growth occurred considerably earlier than the farming or Neolithic periods, more likely  population expansion occurred in the Paleolithic hunter-gatherer period.

3. What did the early ancestors eat?
Ans: The earliest hominins likely had an omnivorous diet similar to that of modern chimpanzees, which includes substantial amounts of fruit, leaves, flowers, bark, insects, and meat.

A Brief on Prehistoric Earth

Introduction

The widely recognized nebular theory postulated that a massive cloud of dust including hydrogen and other gases created the solar system, including the planet earth. Small earthly particles like iron and nickel were created as a result of the earth’s contraction, rotation, and lowering of temperatures. The planet was created approximately 4.5 billion years ago after millions of years of precipitation and accumulation. Since then, the earth’s temperature has decreased, causing the crust to become more fragile. However, the earth’s interior core is still hot and igneous.

A short note on Prehistoric Earth’s Origin of Life

There were numerous theories about the origins of life on Earth. 

  • According to the Panspermia theory, some scientists thought life originated from spores that came from outer space, while others hypothesized that it originated from decomposing materials like dirt, straw, etc (Spontaneous generation theory). Different experiments were carried out by various scientists, and they all disproved the hypothesis of spontaneous generation. 
  • Later in 1953, Oparin and Haldane advanced the theory that life emerged from pre-existing non-living organic molecules like RNA, DNA, and other similar molecules because of abiotic chemical reactions.
  • Numerous studies have suggested that RNA came before DNA, even though it is still unclear what replicating molecule was the earliest. Because RNA molecules can self-replicate and are simpler than DNA, they are considered autocatalytic.

Precambrian Life

The Precambrian period includes the Archean and the Proterozoic eons from 4.6 billion years to 542 million years. Most of the life that existed during the Precambrian period were prokaryotic organisms. Microfossils that looked like stromatolites and cyanobacteria from the Precambrian epoch first revealed the presence of life about 3.8 billion years ago (layered mounds). Additionally, the absence of oxygen in the early atmosphere rendered primitive organisms anaerobic. However, when cyanobacteria developed photosynthesis, it added oxygen to the atmosphere.

Eukaryotes, which have a nucleus, cytoskeleton, organelles, and mitotic spindle, first evolved around two billion years ago. It was once thought that endosymbionts like mitochondria and chloroplasts descended from bacteria. The evolution of eukaryotes benefited greatly from these endosymbiotic relationships.

Image Source: https://commons.wikimedia.org/wiki/File:Timeline_evolution_of_life.svg

Cambrian Explosion- Origin of Animal Diversity

The surge in the diversity of multicellular organisms during the early Cambrian epoch, which began 540 million years ago, is known as the Cambrian explosion. Tens of millions of years before the early Cambrian epoch, the first multicellular living forms began to appear as fossils. These ancient animals have diverse body designs from those of living creatures today. They vanished and were replaced by modern-day animal body types in the Cambrian fauna.

Evolution of Land Plants

The evolution of land plants from a green algal ancestor is a significant event in the history of life since it caused profound changes in the earth’s environment and the formation of the entire terrestrial ecosystem. The formation of land plants and the divergence of the four main surviving clades (liverworts, hornworts, mosses, and vascular plants) may have taken place during the late Ordovician and Silurian periods, according to evidence from fossil spores found in the mid-Ordovician.

Formation 

The majority of researchers concluded that the earliest life form and subsequent other life forms on earth appeared as a result of chemical evolution, or the production of molecules. The Nebular theory, developed by Immanuel Kant and Pierre Laplace, postulates that planets are formed by a cloud of hydrogen and helium. Clouds were created by tiny particle collisions, and the planet itself was created through accretion.

Evolutionary Milestones

  • Life’s history is represented by several milestones. For instance, unicellular organisms first appeared on Earth, and ever since then, diversification has led to the emergence of complex living forms. These living forms will eventually go extinct and be replaced by other creatures. 
  • Complex living forms evolve as a result of this evolution. According to some fossil research, numerous species began to independently become multicellular around 1 billion years ago, and animals started to grow hard portions in their bodies to survive on the earth. 
  • Dinosaurs were the most prevalent class of creatures on the planet for millions of years. For a considerable amount of time, they dominated the prehistoric landscape before a disaster led to the extinction of dinosaurs.
  • The Great Apes, from which humans emerged, was the next significant event. Human evolution is still clearly visible, although it has not yet reached its conclusion.

Presence of Humans

  • The most well-known species, Homo sapiens, is a descendant of hominids, the first creatures that resembled humans. 
  • According to several fossil records, archaeological findings, and embryological research hominids are thought to have diverged from other primate species in the southern and eastern African areas 2.5–4 million years ago. 
  • As a result, they have bipedalism in common (the ability to walk on two legs).
  • Additionally, as hominids evolved and adapted to their habitats, their brain sizes grew. Around 2.3 million years ago, Homo habilis, the earliest human-like hominid, had a brain size of 650–800 cc and started using stone tools.
  • Fossils discovered in Java in 1891 revealed the existence of Homo erectus, the next stage of human evolution, some 1.5 million years ago. They have a 900cc larger brain due to evolution. Then they began to migrate from Africa to Eurasia, where they started to learn how to make fire and develop defenses.

Summary

The widely recognized Nebular Theory postulated that a massive cloud of dust, including hydrogen and other gases, created the solar system, including the planet Earth. The majority of scholars concluded that the earliest life form and subsequent other life forms on earth appeared as a result of chemical evolution, or the production of molecules. Dinosaurs were the most prevalent class of creatures on the planet for millions of years. The most well-known species, Homo sapiens, is a descendant of hominids, the first creatures that resembled humans.

Frequently Asked Questions  

1.What is Coal’s Formation Process? List the Types of Coal.
Ans. The layers of dead plants and animals underwent physical and chemical changes as a result of pressure and heat. Deposits rich in carbon were created as a result of this. Different forms of coal include lignite, bituminous coal, and anthracite.

2.Explain Index Fossils?

Ans. Index fossils are fossils that are used to identify geologic formations with broad regional distributions and short time scales. These fossils are numerous, dispersed, limited in geological time, and unique.

3.What Factors led to the Earth’s Changes?
Ans. Physical changes such as mountain development, tectonic movements, volcanic eruptions, climate changes, and biological changes on the planet resulted from the evolution of new life forms.

4.What are the Necessary conditions for Life to Sustain on Earth?
Ans. The necessary conditions for life to sustain on earth are as follows,

  • Proper distance from the sun
  • Presence of water and the atmosphere
  • Existence of the lithosphere and biosphere
  • Ideal temperature ranges (around 17 degrees Celsius).