The Origin of Humans, Technological Development, and the Environment

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Infographic showing evolution of human


What is Evolution?

Evolution refers to the gradual process of change and development in living organisms, from simple to more complex forms. 

Through evolution, different species of plants and animals emerged, replacing earlier forms.

Theories Explaining the Origin of Man.

Two main theories have been proposed to explain the origin of human beings:

1. The Theory of Creation.

This theory explains that a supernatural power, 'God' created everything, including human beings.

According to religious texts such as the Holy Bible and the Qur’an, God created man from soil.

In the Bible (Genesis 1:26), it is written that God first created a man, and later a woman, marking the beginning of the human family.

This theory is based on faith and religious belief.

2. The Theory of Evolution.

It was proposed by Charles Darwin (1809–1882), an English naturalist.

Darwin’s Theory of Evolution suggests that human beings gradually evolved from lower forms of life over a long period of time.

This process was influenced by environmental changes.

The evolution of man involved improvements in methods of obtaining food, clothing, and shelter.


Stages of Human Evolution.

Humans evolved from the primate family, which includes apes, gorillas, monkeys, and chimpanzees.

Early primates lived in forests, walked on four limbs, and had bodies covered with long hair.

Due to climatic and environmental changes, forests diminished and primates began living in open grasslands.


Environmental changes led to:
  • A shift in movement: from four-limbed walking to walking on two legs, a practice known as bipedalism.
  • The forelimbs were no longer used for walking. Instead, they became useful for making and using tools.

Importany Terms:

Evolution – Gradual development from a simple to a more complex form.

Bipedalism – Walking on two limbs (legs).

Primates – A group of mammals that includes humans, apes, monkeys, and others.


STAGES OF MAN'S EVOLUTION.

1. ARDIPITHECUS / PRIMATES STAGE.

This was the earliest stage of human evolution. Early ancestors of humans, like apes, monkeys, gorillas, and chimpanzees, lived during this time.

Features or Characteristics:
  • Man walked on four limbs.
  • Their bodies were covered with hair.
  • Man lived in dense forests.
  • He had low mental ability.
  • Man totally depended on nature , ate raw food, and relied on hunting and gathering.

2. AUSTRALOPITHECUS (African Family)

This stage began around 12 million years ago when primates started evolving toward becoming human. It includes two main types: Zinjanthropus and Homo habilis.

a) Zinjanthropus (Nutcracker Man).
  • Forelimbs were freed from walking.
  • Used hind limbs for standing and balance.
  • Began to design and use tools.
  • Became more skillful and intelligent.

b) Homo habilis (Handy Man).
  • Lived between 1,500,000 and 750,000 BC.
  • Known as a systematic tool maker.
  • Considered the direct ancestor of modern man.
  • Had a larger brain than Zinjanthropus.
The fossils were found in Olduvai Gorge (Tanzania) and Eastern Rudolf (Kenya).


3. HOMO ERECTUS (Upright Man).

At this stage, early humans could walk fully upright.

Characteristics:
  • Walked on two feet permanently.
  • Made more advanced tools than Homo habilis.
  • Used fire and began to live in organized groups.
Fossils discovered at: Olorgesailie (Kenya), Lake Turkana (Kenya) and Olduvai Gorge (Tanzania).


4. HOMO SAPIENS (Modern Man).

Homo sapiens is known as the "thinking" or intelligent man. His appearance marked the end of the long evolutionary journey from primitive primates to modern humans.
They are believed to have evolved into Homo sapiens sapiens about 50,000 years ago.

Characteristics:
  • He was true modern human.
  • He had large brain size: 1300–1400 cc.
  • He had less thick jaws than earlier humans.
  • He was highly skillful in tool making.
  • Tools were made from stones and bones.
  • He showed signs of complex thinking and creativity.

5. HOMO SAPIENS SAPIENS (The Most Wise Man).

The term Homo sapiens sapiens means “the most wise,” “the most intelligent,” and “the most thinking” man.
This is the final and most advanced stage in human evolution.

Characteristics:
  • Brain capacity: 1400–1450 cc.
  • Most intelligent and innovative human.
  • First to discover fire.
  • First to domesticate animals.
  • Developed language, art, and religion.
  • Built permanent shelters and began early farming.
  • Responsible for modern civilizations.


DEVELOPMENT OF THE STONE AGE.

What is the Stone Age?

The Stone Age was a historical period when early humans made and used tools from stone. Tools included stone arrows, axes, pebbles, and chopping tools.

This age is divided into three major periods:

1. Early (Old) Stone Age.

2. Middle Stone Age.

3. Late (New) Stone Age.


1. EARLY (OLD) STONE AGE

Time period: 1,750,000 B.C to 750,000 B.C

Early human: Zinjanthropus.

Tools: Pebbles and chopping tools.


Main Activities:
  • Hunting and gathering for food.
Used tools to:
  • Kill and skin animals.
  • Dig roots.
  • Cut tree branches.
  • Defend from enemies.

Characteristics of Early Stone Age:

1. Humans lived a primitive life and depended fully on nature.

2. Tools were crude and poorly shaped.

3. Food was raw (e.g., fresh meat).

4. Humans walked upright.

5. Lived in caves.

6. Did not wear clothes.

7. Lived by hunting and gathering.

Important Early Stone Age Sites in East Africa: Olorgesailie, Nsongezi and Olduvai Gorge.

2. MIDDLE STONE AGE.

Time period: 750,000 B.C to 50,000 B.C.

Tools became smaller, sharper, and easier to use, Examples: Spearheads, arrows, knives, stone picks, needles.

Uses of Tools:
  • Digging roots.
  • Killing and skinning animals.
  • Cutting and chopping.

THE DISCOVERY OF FIRE.

Fire was discovered during this age by rubbing two pieces of wood together. The friction produced heat, which led to smoke and eventually fire.

Effects / Importance of Fire to Early Man:
  • Allowed man to roast food (especially meat).
  • Enabled man to live in cold regions.
  • Used to clear bushes.
  • Provided light at night.
  • Used to hunt and kill small animals.
  • Helped to increase working hours.
  • Used to attract prey.
  • Provided defense against wild animals.
  • Used as a signal or communication tool during hunting.

LATE STONE AGE (NEW STONE AGE).

Time period in East Africa: ~50,000 B.C to 1st Millennium A.D

This stage marked great improvements in tools, life, and social organization.

Tools became sharper, smaller, and more refined, called microliths.

Common Tools Used: Stone axes, blades, spears, arrows, etc.

Though still made from stone, they were far superior to those of earlier periods.


Developments/Changes in man's life:
  • Permanent settlements began.
  • Domestication of animals and plants. The first domesticated animal was a dog.
These changes in man's life came to be known as the Neolithic Revolution, meaning a major change from food gathering to food production.

Cave paintings (e.g., at Kondoa Irangi in Tanzania) showed tools, animals, and man's daily life.

Characteristics of the Late Stone Age:

1. Use of better, refined tools.

2. Domestication of plants and animals began.

3. Man became a food producer.

4. Population increased due to constant food supply.

5. Permanent settlements emerged.

6. Division of labor developed:
  • Men had to conduct hunting, defense and tool making,
While,
  • Women did gathering, childbearing and home care.
7. Informal education began, through observation, imitation, and storytelling.


IRON AGE.

This period began around the 1st Millennium A.D. in East Africa.

It was marked by the discovery and use of iron tools, which greatly improved human life.

Iron tools date back about 3,000 years ago.

Origins:

First people in Africa to make and use iron were Ethiopians and Egyptians.

From there, Iron working skills spread unevenly across Africa.

Major Iron Smelting Centers in Africa:
  • Meroe (Sudan)
  • Axum (Ethiopia)
  • Nok (West Africa – Nigeria)
Iron Age in East Africa:

Iron use began during the first millennium A.D.

Iron-smelting areas were: Engaruka, Uvinza, Karagwe, Ugweno and Western shores of Lake Victoria.

Common Iron Tools: Spears, arrows, axes, hoes.


RESULTS / EFFECTS / IMPACTS / CONSEQUENCES OF USING IRON TOOLS

1. Increase in Food Production.

Iron tools made land clearing and cultivation easier and faster, leading to higher agricultural output.

2. Population Growth.

With more food available, communities could support larger populations.

3. Emergence of Specialization.

People began to specialize in different roles, such as:
  • Blacksmiths – focused on making iron tools.
  • Farmers – focused on food production.
4. Development of Political Organization.

The rise of surplus and settlement encouraged the formation of complex villages, chiefdoms, kingdoms, and states.

5. Improvement of Tools and Technology.

Tools became sharper, stronger, and more efficient than stone tools, increasing productivity in farming and construction.

6. Improvement of Security.

Iron weapons (e.g., spears, arrows, pangas) strengthened community defense and warfare capacity.

7. Growth of Trade and Commerce.

Surplus food and iron products encouraged exchange, leading to the growth of local and regional trade.

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