The answer is A: The nucleus.. It is the power house
Answer:
The most obvious and widely publicized barrier to renewable energy is cost—specifically, capital costs, or the upfront expense of building and installing solar and wind farms. Like most renewables, solar and wind are exceedingly cheap to operate—their “fuel” is free, and maintenance is minimal—so the bulk of the expense comes from building the technology.
A and C are the same and thus both wrong. B. The higher the temperature, the more molecules start moving, the more space inbetween them and thus the larger.
Irritation Threshold is defined as the name applies. It is the threshold or maximum point at which an individual has become irritated or annoyed.
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