Answer:
Which sentence from the passage shows that the function of the river depicted here has carried through to modern times?
Explanation:
Why are open systems inappropriate for studying the conservation of mass?? The sample may become contaminated. Matter may be created or destroyed within the system. Heat can escape from or enter the system. Matter may be lost to or gained from the surroundings.
Using the significant figure it would be 27.3
Answer: It is made up of one element