Answer:
levers
Explanation:
A lever is a bar with a balance point called the fulcrum.
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The system of mass reproduction in manufacturing developed during the Gilded age. Hope this helped you.
Answer:
Option B: compounds
Explanation:
Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in fixed rstios, by chemical means.
Answer: Serotonin is likely in short supply
Explanation: serotonin is a neurotransmitter produced by nerve cells that is involved in depression, appetite, and is crucial in maintaining a sense of well-being, security, etc. It is called the happy chemical because of it involvement in making one happy. An imbalance influences the mood of an individual.
