The ability of sperm cells to move along the ductus deferens is due to
a) gravity
b) peristaltic contractions
c) enzymatic activity
d) hormonal action

option B) peristaltic contractions

Explanation:

The ductus deferens, also known as sperm duct is a narrow tube which lead from the epipidymis to the seminal vesicle. It allows sperm cells to move along it by a rhythmic shortening and lengthening of its muscular walls - known as peristaltic contraction.

Thus, it is due to peristaltic contractions

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)