Voyager 1 launched on Sept 5, 1977. It is the man-made object that has travelled the furthest from Earth. How many seconds will have passed in its flight as of 40th anniversary? By the same date, Voyager 1 will have travelled approximately 20,890,700,000 kilometers since launch. How many meters has Voyager travelled? What has the average speed of Voyager been, measured in meters per second (m/s)?

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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b) nuclear ive learned that in a pedtrodic table

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.