Related topics: plos one · genes

Predation risk drives the evolution of the placenta

An international team of scientists led by assistant professor Bart Pollux from Wageningen University & Research has showed that predators are driving the evolution of more complex placentas. They studied populations of the ...

New insights into evolution: Why genes appear to move around

Scientists at Uppsala University have proposed an addition to the theory of evolution that can explain how and why genes move on chromosomes. The hypothesis, called the SNAP Hypothesis, is presented in the scientific journal ...

Tug of war around gravity

In the summer of 2009, theoretical physicist Erik Verlinde had a brainwave that developed into a radical new idea about gravity and the universe as an ocean of information. Ten years later, the last word about this has not ...

Picky pathogens help non-native tree species invade

Walk into a forest comprising only native trees, and you probably notice many different tree species around you, with no one species dominating the ecosystem. Such biodiversity—the variety of life and species in the forest—ensures ...

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Hypothesis

A hypothesis (from Greek ὑπόθεσις [iˈpoθesis]) consists either of a suggested explanation for an observable phenomenon or of a reasoned proposal predicting a possible causal correlation among multiple phenomena. The term derives from the Greek, hypotithenai meaning "to put under" or "to suppose." The scientific method requires that one can test a scientific hypothesis. Scientists generally base such hypotheses on previous observations or on extensions of scientific theories. Even though the words "hypothesis" and "theory" are often used synonymously in common and informal usage, a scientific hypothesis is not the same as a scientific theory. A hypothesis is never to be stated as a question, but always as a statement with an explanation following it. It is not to be a question because it states what the experimenter thinks will occur. Hypotheses are usually written in the "if-then form": If X, then Y.

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