Exposure to a harmful substance in the first 6 weeks of embryonic development is most likely to have an effect on.

What kind of action is a cause of air pollution

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources

The hardy-weinberg principle is that genetic frequencies in a population? will remain stable from generation to generation will always be changing will not be affected by environmental changes are always in a 3: 1 ratio