资讯

来自MSN3 个月
How many bones do sharks have? What to know about the elasmobranch's bodily makeup
Sharks do not have bones. Sharks are elasmobranchs ... Viviparous sharks develop a placental connection to their babies, similar to a mammal's umbilical cord. This leaves some sharks with ...
来自MSN4 个月
Do sharks lay eggs? Here's how the fish gives birth and what some eggs look like.
Placental sharks develop a placental connection to their babies, similar to a mammal's ... Aplacental sharks do not have a placenta and their embryos rely on a yolk-sac or unfertilized egg ...
The Independent4 天
Where do whale sharks mate? The search to learn where the magic happens for the world's ...
Whale sharks shouldn't be hard for scientists ... and they've never observed it before. They do finally have some clues, though. Scientists suspect the magic may be happening in the waters around ...
Natural History Museum%2c London4 个月
Do sharks have bones?
Sharks don’t have bones. Their skeletons are made of cartilage - the same soft, flexible stuff as your ears and the tip of your nose are made of. This is true for all sharks, from the formidable great ...