Explain an earthworm’s movement on a plain glass tile

Earthworms have microscopic hairs or bristles all over their body which provide the necessary traction while movement. ... Glass is smooth in nature so earthworms cannot move as the setae will not get sufficient surface support to move the body.

Explanation:

It is called fertilization, an egg is penetrated by a sperm cell, and the haploid genetic information of both male and female gametes combines. The result of this process is a diploid cell called a Zygote. A zygote cell receives half chromosomes from its female parent and half from it's male parent.