Answer:
Distance
Explanation:
The light-year is a measure of distance, not time. It is the total distance that a beam of light, moving in a straight line, travels in one year.
Answer:
a physical property
Explanation:
Color does not change state.
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Answer:
One or more number of species which have same number of atomic number but different mass number are called isotopes.
For example,
are the isotopes of hydrogen.
So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.
B. Conducts heat readily.
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