Examlex
To colonize,land plants had to overcome a number of difficulties.However,once this occurred they were able to exploit more abundant resources.Which of the following resources were more plentiful on land than in water during the early evolution of land plants?
Theory
A system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
Nondirectional Research Hypothesis
A hypothesis that predicts a relationship or effect but does not specify the direction of the relationship.
Directional Research Hypothesis
A hypothesis that indicates the anticipated direction of the difference or relationship among variables.
Null Hypothesis
A type of hypothesis used in statistics that proposes that no statistical significance exists in a set of given observations.
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