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
so basically the stronger the sperm cell.. the faster it moves.... and it can move with a speed of 10 (to the power) 6 mm per sec. we can also say that this is one of the best example of Sir Darwin's theory of the  SURVIVAL OF THE FITTEST...nce ejaculated out of the penis, sperm travels up the vagina. It then goes through the cervix, which is the entrance to the uterus. Once inside the uterus, it goes towards th â¦ e fallopian tubes in search of an egg. If no egg is found, it dies within 48 hours.