Which of the following statements is true of crossing-over? A.
Only one gene may be exchanged at a time during crossing-over. B.
The gene for eye color can be exchanged with the gene for hair color during crossing over.
C.
Crossing-over contributes to genetic diversity or variation.
D.
Crossing-over always results in a non-beneficial mutation.

47

explanation:

ok

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.

thinking it would be d not too sure but i think it's right