Earth can be considered as a closed system, since it only receives sunlight (energy), while the overall mass stays constant, without (almost) any exchange from space. Another example of a closed system is a saucepan or frying pan, on a stove, when its lid is closed.
An advancement in the field of learning that took place during the Han Dynasty:
the writing of Historical Records by Sima Qian
Sima Qian created the Grand Scribe’s Records which is still used by modern historians.
However, United States imports from the trade agreement countries were Jess in 1938 than 1937 in every case except Haiti and Honduras, and United States exports also dropped except to Honduras, Colombia and Costa Rica.
Answer:
umm just take deep breaths
