Entropy means that system naturally progress from order to disorder. Entropy measures the level of this disorder or messiness. We can measure increase or decrease of entropy, for example by answering the question 'How a human being can avoid decay?' or by being concentrated on WHY the system is more organized and why it tends to grow.
One year. It takes 365 days for Earth to orbit the sun.
I think it is d because the other places are of course wet lands.
