Sharks

By mst monira khaton

Sharks are fishes and they have a skeleton but sharks skeleton are made of light flexible cartilage. That's why sharks are called a group of cartilaginous skeleton elasmobranch fish, they have pectoral fin. Rays are the sister group of sharks. Sharks are appeared on the water world before 420 million years ago.

• Format: Paperback
• Language: English
• ISBN: 1651032238
• ISBN13: 9781651032237
• Release Date: February 2020
• Publisher: Independently Published
• Length: 46 Pages
• Weight: 0.13 lbs.
• Dimensions: 0.1" x 5.0" x 8.0"