A scientist wants to study bird predation of peppered moths. In a natural environment, they put light moths and dark moths on the trunks of trees and observe the moths for 30 minutes. The scientist records if each moth was eaten.  What was the independent variable in this experiment?

Which pair of species is most closely related: Lily and Sunflower or Lily and Tulip?

If a group of rabbits had a high mutation rate and frequently had new rabbits migrate into their group, what would happen to the amount of genetic variation in this rabbit population over time?

Bismuth

Germanium

Fluorine

Chromium

Helium

Silver

Silicon