Search results
Results from the WOW.Com Content Network
Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]
[1] [2] [3] The earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago. [4] [5] [6] Evolution does not attempt to explain the origin of life (covered instead by abiogenesis), but it does explain how early lifeforms evolved into the complex ecosystem that we see today. [7]
In the Indian education system of some Indian states, the pre-university course (PUC) or pre-degree course (PDC) is referred to as intermediate or +2 course, which is a two-year senior secondary education course that succeeds the tenth grade (known as SSLC or SSC in such states, equivalent to sophomore in the US system) and precedes to the completion of a Senior Secondary Course.
The Intermediate Education, also known as Higher Secondary Classes (HSC)/11th & 12th class is a two-year course conducted by the Andhra Pradesh Board of Intermediate Education. Is one of State secondary education boards of India. The board currently offers 85 streams and courses. BIEAP offers general and vocational groups.
Multiregional evolution holds that the human species first arose around two million years ago and subsequent human evolution has been within a single, continuous human species. This species encompasses all archaic human forms such as Homo erectus , Denisovans , and Neanderthals as well as modern forms, and evolved worldwide to the diverse ...
The HSC/Intermediate and PUC Certificates are known as the "Class 12th Certificate" or the "+2 Certificate". It is awarded to senior high school students by almost all National and State Boards and It is also awarded to junior college students by some state boards.
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype.It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
The synthesis also resulted in a considerable narrowing of the range of mainstream evolutionary thought (what Stephen Jay Gould called the "hardening of the synthesis"): by the 1950s, natural selection acting on genetic variation was virtually the only acceptable mechanism of evolutionary change (panselectionism), and macroevolution was simply ...