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RSSProkaryote
Prokaryotes are organisms
without a cell nucleus, or
indeed any other
membrane-bound organelles,
in most cases unicellular
(in rare cases,
multicellular). This set of
characteristics is distinct
... > full story
Crust (geology)
In geology, a crust is the
outermost layer of a
planet.
The crust of the Earth is
composed of a great variety
of igneous, metamorphic, and
sedimentary rocks. The crust
... > full story
Introduction to genetics
Genetics is the study of how
living things receive common
traits from previous
generations. These traits
are described by the genetic
information carried by a
molecule called DNA. The
... > full story
Genetic drift
Genetic drift is the term
used in population genetics
to refer to the statistical
drift over time of gene
frequencies in a population
due to random sampling
effects in the formation of
successive generations. In a
... > full story
Browse Reference Articles
1 to 10 of 145 articles
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Neandertal interaction with Cro-Magnons
Neanderthals apparently co-existed with anatomically modern humans beginning some 100,000 years ago. However, about 45,000 years ago, at about the time that stoneworking techniques similar to those ... > more -
Multiregional hypothesis
The multiregional origin hypothesis of human species holds that some, or all, of the genetic variation between the contemporary human races is attributable to genetic inheritance from either Homo ... > more -
Natural selection
Natural selection is the phrase Charles Darwin used in 1859 for the process he proposed to explain the origin of species and their apparent adaptation to their environment. Along with the rules of ... > more -
Timeline of human evolution
The timeline of human evolution outlines the major events in the development of humans species and the evolution of human's ancestors. It begins with the time of the origin of life and presents a ... > more -
Timeline of evolution
This timeline of the evolution of life outlines the major events in the development of life on the planet Earth. Dates given are estimates based on scientific evidence. In biology, evolution is the ... > more -
Recent single-origin hypothesis
The single-origin hypothesis (or Out-of-Africa model) is one of two accounts of the origin of anatomically modern humans, Homo sapiens. Because of the scarcity of fossils and the discovery of ... > more -
Microorganism
A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). Microorganisms are often illustrated using single-celled, or unicellular organisms; ... > more
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