The right answer is more Chemical bonds.
Lipids are the most energetic macronutrients (as a reminder: 1 g of lipids represents 9 kcal, against 4 kcal for 1 g of carbohydrates or 1 g of proteins). Lipids are the molecules present in the fat of foods. They divide into saturated fatty acids and unsaturated fatty acids. These fatty acids can contain between 4 and 20 carbon molecules while carbohydrates contain between 3 and 6 carbon molecules.
The answer is B because:
Cell walls are made of cellulose and proteins (hence II).
Animal cells don't have cell walls (only cell membrane) but plant cells do so IV
They must be semipermeable since materials for example carbon dioxide and water for photosynthesis have to go into the cell <em>some</em> way.
Sensory processes are responsible for converting sensory messages into neural impulses
The coral reef structure buffers shorelines against waves, storms, and floods, helping to prevent loss of life, property damage, and erosion. When reefs are damaged or destroyed, the absence of this natural barrier can increase the damage to coastal communities from normal wave action and violent storms.
hope this helps ^ ^