D. Things that are kept constant.
Controls are used in an experiment where some variable is being changed. By only changing one thing and keeping the others constant they can make sure that any change in the results is caused by the variable and not the constant, since the constant didn’t change.
Answer:
If you're pulling something with a handle at an angle, part of the force you are exerting is up or down on the handle. So, you would want to have the handle be as close as possible to the angle you're pulling it in (parallel with the ground) to have maximum force pulling the load.
Explanation:
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The purpose of a sharps disposal bin in a laboratory is for when your done using things such as dirty needles, medical items, broken pieces of metal. This is to prevent you from either being exposed to an item that is sharp or to just prevent you from something on the item that could cause harm.
