What event might occur when favorable adaptations build up in a population over many generations?

starvation
extinction
migration
speciation

Speciation ( which is when new and unique species from during evolution) is an event that may occur when favourable adaptations build up in a population over many generations ;)

Ihaven't done that yet, so no idea,but this is not the right place to ask

1) clean up you lab area2) dispose of the chemicals as instructed by your teacher3) put everything back where it belongs unless your teacher tells you otherwise4) dispose of gloves5) wash hands with soap and water