5. Which animals have true tissues, and which have organs? 6. What is the difference between radial and bilateral symmetry?
7. Distinguish between a coelom and a pseudocoelom.
8. What are the two main types of digestive tract?
9. What advantages does segmentation confer?

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

yes, because even though a theory has a  lot of evidence to support it, it is not always true