1) A dog has the same mass for 3 years. State whether this represents an equilibrium or steady state situations, and give your reasons.

I'm not sure if I got this question right...

I think this is a steady state because the dog is opened to the environment where oxygen is free to enter and go. The dog has probably reached its full growth and is receiving consistent amount of food each day and exercise which is why the mass is the same. Also matter and energy can leave the dog which makes it an open system

Thanks in advance!

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  1. Steady state is correct. Here is a very good article on the difference.
    I think most of what you have is correct but you may want to modify it here and there after reading the above reference.

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