The different stages of human life are fetus, infancy, childhood, adolescence, adulthood and old age. The human life cycle starts at fertilization, goes through the embryonic stage and the fetal stage. After fetal growth and birth, the second stage is infancy, which is the period between birth and one year.
During infancy, a child learns to walk, eats solid food, and has some teeth. Childhood follows after infancy and is a period that last from the first year of life to about the age of 10. Between the ages of 11 and 13, a child can enter the pubescent stage and adolescence begins. This stage occurs typically between the ages of 10 and 19.
In adulthood, humans have a completely developed body. In their 20s, humans are at their peak. From the age of 30 to old age, the aging process begins and some noticeable signs are thinning skin, the appearance of wrinkles and muscle mass decreases.Learn More
All fossil remains of Homo habilis originate from Kenya or Tanzania in northeastern Africa. At the time, these areas consisted of semi-arid grass plains interspersed with small woodlands. Archaelogyinfo.com notes that there is paleoecological evidence that many early hominids lived in marginal woodlands, and this is reflected in the remains of Homo habilis.Full Answer >
There is evidence to suggest that archaic humans, of which modern humans are descended, were present as long as 195,000 years ago in what is now Ethiopia, as fossils recovered from the region show the beginnings of skull changes that evolved into the modern human skull. The first early human fossils were discovered in 1868 in southwest France.Full Answer >
Index fossils have several important characteristics, such as wide geographic abundance, easy identification and a relatively short geological existence. These characteristics make the fossils useful for identifying the age of the geologic formations where they are found.Full Answer >
Both cuneiform and hieroglyphs were developed around 4000 B.C. Among the earliest forms of writing, they both began as pictographic forms which over time became more abstract and included phonetic elements.Full Answer >