true or false Metabolism is the sum of all physical and chemical changes that take place in the body?

Answer 1

True. Physical and chemical changes occur in body constantly. Every chemical change is associated with a physical change. If more steroids are produced more fluids are retained.

Answer 2

Chemical Change Can't be observed Without changing the material I'm struggling to make sense of this. False: it can be observed without changing the material. Iron (grey metal) changes to iron oxide (red, non metal). Can we observe the change? Yes, easily. Did the act of observing change the material (rust)? No, obviously not. Unless this is a translation of a foreign language whomever wrote this needs some serious English lessons. Chemical change is about material change, but so is a physical change. A material is composed of one or more chemicals. Melting ice is a physical change that changes the material (from solid to liquid) but is not considered a chemical change. If you analyze the question posed there is no mention of "Physical Change", so I do not understand why you write about it, especially if it is a true or false question. A "tautology" is some statements which have to be true. Breaking down the question .."change can't be observed without change" - the answer seems pretty obvious doesn't it? But if the question is: Can a chemical change occur WITHOUT visibly changing the material, the answer is yes. I can make a chemical change without observable change. For instance I can bombard a polymer with radiation and break the polymer chains. This happens in airplanes and makes the plastic composites weaker, and it is very hard to find, hard to observe.

Answer 3

Here is the definition from Wikipedia;
Metabolism is the complete set of chemical reactions that occur in living cells.
What you wrote above is pretty much the same definition. However, I believe it is all chemical.