If the sealed glass is permeable to sunlight or to transfer of heat will be an open system, but if the sealed glass is a thermic glass and doesn't allow exchange of heat and exchange of solar energy (for example a mirrored glass that reflect the sunlight) and the terrarium is not exchanging energy with the surroundings will be a closed system. It is a question that doesn't specify too many details about the system in the study. It is hard to give a final answer without making some assumptions.
Answer 19.9g. I’ve took the test last week at my uncle randy’s house
Answer:
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Number 9 adding oil lubricates the chain making it easier to pedal. Also the oil prevents rusting
You put in a variable to substitute the unknown number.
