Why do producers make up the base of the energy pyramid

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?

Match the enzymes to their role in the dna replication process

Transposon can cause mutations in genes at or near the site of transposon insertion. it is possible for these elements to transpose away from their original site, causing a reversion of the mutant phenotype. in some cases, however, even more severe phenotypes appear when these elements excise from this site, due to events at or near the mutant allele. what might be happening to the transposon or the nearby gene to create more severe mutations?