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
Best Answer: As you can probably guess, a lot of studies measure fish swimming speeds in two ways -- sustained speeds and burst speeds. Burst speed is how fast the fish can swim for very short periods (seconds). Sustained speed is how fast the fish can swim for longer periods (several minutes and up). Even so, determining exact swimming speeds for various fish species is difficult because there are so many variables to consider -- water temp, water speed, water depth, fish size, and fish health.