What forms the double layer that makes up cell membrane

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Which state of matter has the following physical properties: ~ takes the shape of the container it is in ~ takes the volume of the container it is in ~ low density. answer is gas

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals