Many plants have waxy coatings on some surfaces. this coating reduces water loss because it is not water permeable( water cannot get inside). this waxy coating is which of the following types of organic molecule? carbohydrate, lipid, protein, nucleus acid?

The question is asking to choose among the following choices that states the types of organic molecule  that is present to the kind of waxy coating in the said problem and base on my research, the answer would be Lipid, I hope you are satisfied with my answer and feel free to ask for more 

ANSWER

B and D

The total density of the ship is based on its mass divided by its volume, not just on the density of the materials used in making it.

A solid block of steel will sink in water.