Answer: in order for a scientific investigation to be valid A hypothesis must be tested throughout a Scientific investigation that can gather evidence and support it.
Explanation: in any scientific investigation you have to have a testable hypothesis, without your hypothesis it’s not really a scientific investigation.
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<span>What is the approximate age of our solar system?
</span>b. 4.6 billion years
It will be a Compound, because it will use Multiple Optical lenses
Answer:roll it down a hill
Explanation:of you roll it down a hill the item builds energy
