Select all of the following that must be true in order for evolution by natural selection to be taking place: (you may select multiple answers)

Group of answer choices

Survivability: some organisms in a population will survive, some organisms will not

Heritability: traits must be able to be passed down from parent to offspring

Catastrophe: something in the environment must change suddenly, like a natural disaster or introduction of a predator

Selection/Advantage: survival and ability to reproduce depend on an organism's traits

Desirability: at least some organisms in a population must want or need to change

Variability: individual organisms in a population must have traits that are different from each other, like fur color, number of leaves, or tail length

Blendability: genes need to be mixed between males and females