These group of cells represent different

a. organelles that carry out different functions
b. tissues in which similar cells function together
c. organs that to carry out a specific life activity
d. systems that are responsible for a specific life activity

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In the image, these groups of cells perform the same function. The correct answer is "tissues in which similar cells function together". For instance, the cells from the bladder lining, collectively, have the ability to transform from stratified to squamous epithelium therefore accommodating the storage of urine. 

There would be no evaporation so no water cycle