By tar, I think you mean nicotine. (I Hope). It affects the nerve signals that regulate breathing.
The lipid bilayer works as a barrier that protects the cell from outside dangers.
C. prevent the passage of certain molecules into the cell
Hope I helped! :)
<span>The final product of mitosis is a full set of DNA.</span>
Sorry I am a week late in answering this but it helps people later. The answer I got was this:
Groundwater is an important source of freshwater, partly because it accounts for approximately 30% of the Earth's freshwater.
I know this is a little late but I hope it helps you later on.