When a person inherits the following combinations of alleles, which is dominant? Remember, the answer can be one of the alleles or both of the alleles.
• A and B
• A and O
. B and O

You need just one copy to be dominant. Let's assume A is dominant so A & B

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

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