The earliest arrowheads were made of stone and of organic materials. As human cibilation progressed other materials were used.
The answer in the given choices above is tranquilizers, it
is because valium is a tranquilizer in which another example of this is also
xanax. Tranquilizers have the ability of inducing relaxation and to reduce
anxiety when injected to the person.
It's is used by putting the lager chromosomes on the bottom and the smaller ones on the top so when they get DNA sample of something they can she if some thing is closely related or not
Light microscopy uses ultraviolet light