The process of grouping things based on their similarities is classification
This would <span>be caused</span> by a reversal of the temperature in the troposphere<span> (the region of the atmosphere nearest the Earth's surface), in which a layer of cool air at the surface is overlain by a layer of warmer air.</span>
Cell membrane is made up of Lipid Bilayer which are fluid in nature , means they move continuosly , due to this fluid nature they are selectively permeable to compounds.
I think #1 is pointing to the cell membrane
#2 is pointing to the nucleus
#3 is pointing to the chromosomes
and #4 is pointing to the cytoplasm
