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
Fast and Basic. The fastest stroke for most swimmers is the front crawl. The crawl begins in a facedown position with arms and legs extended. The arms alternate pulling against the water along the front of the body, exiting the water just below hip level.utting It All Together. Freestyle events in swimming meets allow competitors to use any of the four competitive strokes -- crawl, breaststroke, butterfly or backstroke. It's not uncommon to see an athlete vary between strokes in long-distance events, but the crawl is almost always used in sprinting competitions.