The scientist should do the following to make sure that their scientific investigation is replicable is by having to have their studies, researches and experiments to be written down as this will serve as a basis and a way of having to have a solid proof of having the investigation or experiment to be conducted again or to be replicable.
Answer:
D
Explanation:
My logic: Electricity produces heat, chemical reactions produce heat. And so on.
Answer:
The correct answer is hydrogen.
Explanation:
Stars in the main sequence will remain in the main sequence as long as their cores contain hydrogen atoms. This is because main sequence stars run on the hydrogen atoms within their core to prevent them from falling to the force of gravity. Once these hydrogen atoms run out, the star is no longer considered a main sequence star, gravity takes hold, and the star collapses.