Your mom. no
The term supernatant scientifically refers to lying above a precipitate or sediment. Supernatant scientifically also refers to floating on the surface of a liquid.
In the last boss, the crest is an hourglass. But, if you mean the other crest, it's the Triforce.
It's not an idiom. It means just what it says -- something is on the crest of a wave. The crest is the top of the wave.
which crest if you mean the triforce or hourglass, you have to draw it on the door, if you mean the sacred crest, it is past the first red door, the one you draw the hourglass
5
False
it is totally wrong for human to bear twins, i mean scientifically.
Not sure what you mean by "scientifically funny", but a joke can be both scientific, i.e. about some science topic (and perhaps even scientifically accurate), and funny.
The crest on a horse is the curved part of the top of the neck slightly back from poll and the bridlepath.
I assume you mean, the crests of a wave. That distance is called the wavelength.
Crest
The term modulate means to exert a modifying or controlling influence on the state of something. In other words, it means to vary some characteristic of a signal in an experiment.