Phospholipids make up biological membranes .a. have hydrophobic tails that face outward and are exposed to water. b. None of the choices are correct. c. have hydrophobic heads that face the center of the membrane and are shielded from water. d. remain fluid because they are tightly packed against one another. e. often have "kinks" in their tails caused by the presence of a single rather than a double bond between carbons.

Phospholipids make up biological membranes None of the choices are correct.

Explanation:

Phospholipids make up biological membranes but not having the following  hydrophobic tails that face outward and are exposed to water nor having hydrophobic heads that faces the center of the membrane and are shielded from water nor remaining fluid because they are tightly packed against one another often have "kinks" in their tails caused by the presence of a single rather than a double bond between carbons

chemical because it warmed up which involves temperature and it bubbled which includes changing

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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.