What does this demonstration show?

Which of the following describes a situation where competition between producers exists

Which statement justifies that hydrogen peroxide (h2o2) is a polar molecule? the o – h bond is nonpolar and the molecule is asymmetric. the o – h bond is nonpolar and the molecule is symmetric. the o – h bond is polar and the molecule is asymmetric. the o – h bond is polar and the molecule is symmetric.

Which example is a mechanical wave?     a.microwave    b.radio wave    c.water wave    d.ultraviolet light