A student says that one individual giraffe evolved during its lifetime. Why is that use of the word wrong?
Because evolution refers to the appearance of a completely new species
Because evolution happens in a stable environment rather than a changing one
Because an individual evolves after it has reproduced
Because evolution describes change in a population over generations✓Bonne réponse
Explication
An individual keeps the alleles it was born with, so nothing about its inherited makeup changes as it grows, however much its body alters. What changes over time is how common each allele is among all the members of a population, and that can only be seen by comparing one generation with the next.