ligers are a cross between lions and tigers. they exist only in zoos because lions and tigers do not live together in the wild.which is a reason why lions and tigers are considered separate species? 1.lions and tigers do not look alike.2.ligers cannot reproduce.3.lions and tigers cannot reproduce.4.ligers are found only in zoos.

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.

it marks things for degradation via the proteasome. it alters there celluar location.