Cathode rays are streams of electrons.
it moves the body tube and pbjectives up and down
intestine
The Fallopian tube.
Pollen
Zygote
it is a muscle tube that moves food
windpipe; tube through which air moves.
tube feet can suck anything, but moves slow.
That is the tube in which the egg moves to the uterus from the ovaries.
a starfish moves by how it has little tube feet on the bottom of it.
Pipe?
The Coarse focas knob, or the coarse adjustment moves the body tube in large movements both up and down.