Which of the following waves can travel through a medium, but does not require the medium to propagate?

The minerals found in bones are deposited by living cells called

How are isotopes of the same chemical element alike? how are they different?

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.