Answer:
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The first species that colonizes new of undistributed land is called as pioneer species, or simply pioneers. If you check the meaning of pioneer, it's a type of person or entity that became the first to explore or exploit a certain something. In this case, they were the first species who explores the lands to create a society.
A scientific theory changes when there is more information available about what the theory covers.
D) It is based on the position of rock layers.
