WebbMALE: Internally males have two muscular sacs (siphon sacs) in their abdominal wall and testes that produce sperm. These also secrete hormones that control the development of male characteristics. FEMALE: Females have a pair of ovaries where eggs are produced. These also secrete hormones that control the development of female characteristics.
Placoid scales - The Australian Museum
http://www.elasmo-research.org/education/white_shark/hearing.htm Webb8.4K views 2 years ago Shark Smarts Educational Videos. Join the AWSC Education … how many levels of feather falling
Male & Female Sharks The Shark Trust
WebbMost sharks have eight fins: a pair of pectoral fins, a pair of pelvic fins, two dorsal fins, an … Sharks have 2 types of muscle - red and white. Red muscle works by breaking down the fat in the shark’s body. It has a good blood supply and helps the shark swim for long periods of time. White muscle works by using energy from the breakdown of glycogen (sugars). Enabling sharks to make short fast sprints … Visa mer Shark skeletons are made of cartilage. This is strong and durable, yet much more flexible and lighter than bone. Being lighter helps a shark to stay afloat and reduces the amount of energy they need to move about. The flexibility of … Visa mer Shark skin is covered with millions of tiny teeth called dermal denticles. These point backwards, reducing surface drag and helping the shark swim faster. As a shark grows they shed their denticles, replacing them with larger ones. … Visa mer Fins provide balance and stability in the water. Sharks have a large dorsal fin which provides balance. Usually they'll also have a smaller dorsal fin … Visa mer Made of enamel, shark teeth are strong and appear in huge numbers in the fossil record. Sharks fend for themselves immediately after birth, so they're born fully equipped. They have many rows of teeth which are … Visa mer WebbAccording to the Shark Trust conservation organization, sharks hear sounds with frequencies ranging from 10 hertz to 800 hertz, and they are particularly responsive to sounds lower than 375 hertz. For comparison, … how many levels of cache are there