Question

darwins observations for natural selection
which of the following is not an observation made by darwin?
multiple choice
members of a population vary in their functional, physical, and behavioral characteristics.
there is a constant struggle for survival of organisms.
organisms in a normal population differ in reproductive success.
evolution is ultimately a change in allele frequencies in a population.

Explanation:

Darwin made observations about variation within populations, struggle for survival, and differences in reproductive success. The idea that evolution is ultimately a change in allele frequencies in a population is a more modern - population - genetics based concept and not one of Darwin's original observations.

Answer:

Evolution is ultimately a change in allele frequencies in a population.