Answer:
The evolution of humans started about 6 million years ago when hominids, bipedal primates, began to walk upright. The first hominids were Australopithecus, which lived in Africa about 4 million years ago. Later, the genus Homo appeared, with Homo habilis being the first species to make and use tools. Homo erectus, a more advanced species, appeared about 2 million years ago and migrated out of Africa. The species Homo sapiens, our own species, emerged in Africa about 300,000 years ago.
The Agricultural Revolution, which began around 10,000 years ago, marked a significant turning point in human history. It led to the development of agriculture and animal husbandry, which allowed humans to settle in one place and form more complex societies. This led to the development of civilizations, with cities, governments, and social hierarchies.
Climate change has had a significant impact on human development, as early humans had to adapt to changing environmental conditions. For example, during the last ice age, humans developed new technologies to survive in colder environments. We know about early humans through the study of fossils, archaeological sites, and genetic analysis.
Being human means having characteristics that distinguish us from other animals, such as the ability to use language, make and use tools, and develop complex social structures. It also means having the capacity for abstract thinking, creativity, and self-awareness. However, defining what it means to be human is a complex and ongoing philosophical and scientific discussion.