If radioactive nucleotide bases were provided to bacteria during dna synthesis, then after cell division you would find:
1. both bacteria would be equally radioactive.
2. one bacteria would be radioactive and the other not.
3. neither would be radioactive because dna polymerase can distinguish between isotopes.

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.

a community that experiences major changes undergoes progress

this is math not biology xd