Natural selection explains adaptive change in the immediate environment.
A scientific theory is a well tested concept that explains a wide range of observations.
A theory. (And sometimes called a law.)
It is a scientific theory.
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OBLIGATION
Obligations
A uniform pattern of rhythm in a poem :)
conflict theory
recognizable system of elements created by repetition or sequence
The concept that explains the presence of mitochondria in cells is the endosymbiotic theory. Mitochondria in cells derived from the extra embryonic membranes.
This would be an expository essay, which explains a concept in detail.
A point has o size. It is a mathematical concept with no length, width, depth, height.
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Theory
The verb "explains" is transitive because it requires a direct object to complete its meaning. For example, in the sentence "She explains the concept," "the concept" is the direct object receiving the action of the verb. Without a direct object, the sentence would be incomplete and unclear.
Explain is present tense. I/We/You/They explain He/She/It explains The present participle is explaining.