The mass of the Earth is 81 times the mass of the Moon and the Moon is about 400,000km from Earth. Using Newton's Law of Gravity what would the affect of gravitation be if the mass of the Earth was doubled?

We know that,

"Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces."

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.