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The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
In relation to biological organisms. Zygote, at the start of an organism's life. Embryo, early in an organism's life. Foetus, early in an animal's life, occurring before birth. Larva, an early stage in many animal life forms before maturity. Child, early human life.
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction. All life over time eventually reaches a state of ...
Early childhood development. Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age. [1]
Poor nutrition early in life contributes to stunting, and by the age of two or three can be associated with cognitive deficits, poor school achievement, and, later in life, poor social relationships. [184] Malnutrition is a large problem in developing nations, and has an important effect on young children's weight and height. Children suffering ...
The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence, mainly fossils. In biology, evolution is any change across successive generations in the heritable ...
The history of the family is a branch of social history that concerns the sociocultural evolution of kinship groups from prehistoric to modern times. [1] The family has a universal and basic role in all societies. [2] Research on the history of the family crosses disciplines and cultures, aiming to understand the structure and function of the ...
In psychology, the term early childhood is usually defined as the time period from birth until the age of five or six years, [1] therefore covering infancy, Pre-K, kindergarten and first grade. There are three simultaneous development stages: [2] It is distinct from early childhood education, and does not necessarily refer to the same ...