Which type of organic compound is generally not soluble in water and makes up an important part of biological membranes?

Lipids is the organic compound that is generally not soluble in water and makes up an important part of biological membranes.

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.