1 If you're under 16, it can helpful to bring along a parent or guardian for the initial interview with the people seeking babysitting. 2  This reassures the other parents that your own parents are invested in your success and that you mean business, and it also protects you.
Evolutionary biology. Fitness (often denoted w {\displaystyle w} or Ï in population genetics models) is the quantitative representation of natural and sexual selection within evolutionary biology. It can be defined either with respect to a genotype or to a phenotype in a given environment.
Evolution is the change in heritable traits within populations over time. Often the definition is more focused to mean changing allele frequency within a population over time. Selection (including sexual, kin, etc) is one way that allele frequencies can change and it is the only mechanism that produces adaptation.