[ 207 ] Life Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Tapeworms are segmented flatworms that attach themselves to the insides of the intestines of host animals such as cows, pigs, and humans. They survive by eating the host’s partly digested food, depriving the host of nutrients. This is an example of which kind of relationship? The plasma membrane of a cell regulates transport of materials. Osmosis occurs when molecules inside a cell are highly concentrated and are forced to move through the membrane to an area of lower concentration. What is the word for this pressure that pushes these molecules? When osmosis occurs in a cell, where molecules move from where they are highly concentrated through the cell membrane to where they are less concentrated, what is the word for these concentration levels being the same?