The diagram shows a heating curve for a substance.
Which segment shows the substance changing from a gas
to a liquid?
Heating Curve of a Substance
O X-Y
Y-X
W-X
X-W
Temperature (Cº)
Heat Added (3)
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Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

One nanometer is equal to how many meters?

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community