Egg-Laying Sharks. Of the approximately 400 species of sharks, about 40% lay eggs. This is called oviparity. When the eggs are laid, they are in a protective egg case (which sometimes washes up on the beach and is commonly called a mermaid's purse).
what s the truth i am asking this b c there seems to be posts on here that say y sperm swim faster which is what we all prob have heard for the longest time but there have been some recent posts on here that state newer studies now say y sperm aren t any faster than x and they can both swim just as fast so im just wanting to know which one is true if anyone really knows thanks
In brief: Sperm motility. Sperm lose viability after 1 hour in the vagina but can survive up to 3-4 days beyond the cervix. Sperm can reach at the end of the tubes 10-15 min after ejaculation. Sperm can travel fast when the cervical mucus is clear and thin (2-4 days before ovulation); however, once ovulation occurs, the mucus gels up and thicken in order to protect the uterine cavity, thus making sperm movement much harder.