Answer:group A
Expination its quite obvious because in the first every thing became steam powered and then but then in the second one electricity and petroleum became main power sources as they were more effeciant
Answer:
Trade networks resulted in the widespread exchange of ideas and resources.
Explanation:
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assisting the industry in producing effective medicines
It gave them real life details to work with.
Secondary succession happens in a place where there had been living organisms. ... The soil contains little dead vegetation.