Based on the model of movement through the phospholipid bilayer, what is the most likely choice for the substance crossing the membrane? A) water B) glucose C) oxygen gas D) sodium ions

The correct option is C) oxygen gas

Explanation:

The cell membrane is a phospholipid bilayer membrane which is selectively permeable. This selectively permeable membrane allows the movement of small, uncharged molecules or substances easily through it by the simple method of diffusion. Hence, among the options mentioned, oxygen gas which is small and uncharged will be easily be able to pass through the cell membrane by the process of diffusion. Other molecules, like large molecules, require other methods such as carrier proteins for movement across the cell membrane.

i'd say that the moon rock is about 2.2 billion years old.

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.