Besides activating the egg, another role of a sperm is to carry to egg

Explain the penetration mechanism of a sperm into an egg.

Give the life span of a. sperm , b. egg

From where sperm enters the egg?

How does the sperm reach up to the egg and how does it enter into the egg?

Which of the following helps in the penetration of a sperm in to egg?

Eggs and sperms in sponges are

Very similar species of fish release their eggs and sperms into the same water but the spermof one species cannot penetrate the eggs of another spicies. This is an example of prezygotic isolation by

Sperm enters the egg from

Sperm enters the egg from