Cell Processes and Transport: Tutorial Part B
What are the strengths and weaknesses of the cell model?
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try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully