Which of the following statements is true?

organisms that evolve in the same environment often have homologous structures.
since there are gaps in the fossil record, it cannot be used as evidence for evolution.
human morphology and embryo development is very different from all other organisms.
the more similar the embryonic development of two species, the more closely they are related

The more similar the embryonic development of two species, the more closely they are related

Explanation:

According to the biogenetic law, the stages of embryological development of organisms of a species represents the stages of their evolution. Hence, if two organisms from two species share common or similar stages of embryonic development, they are supposed to be more closely related to each other in terms of evolution. It represents the embryological evidence of evolution and sets the phylogenetic relationship between species.

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.