My work is as simple as a lock and keywithout my shape, my work isn't as good as can bewhat am i?

Which best summarizes what scientists learned about how microbes benefit the human body? they are part of a normal human ecosystem. they have become less harmful to humans than they used to be. they process nutrients, fight disease, and accommodate change. they humans overcome the effects of antibiotics.`

Afigure of speech which explicitly compares two different things using the words "like or as", sometimes referred to as approximations?

Atrajectory has an initial velocity of 1,000 meters per second, and 5 seconds later, it has a velocity of 500 meters per second. which is the acceleration of the trajectory?