The gnathostomates

The fins in a shark are rigid or bland? what is the purpose of this particularity?

Lives beyond 2000 mts under the sea level and is considered as an ancestor of sharks

• Chimaera

• Ray

• Sea ghost

• Stingray

The shark is capable to identify __________ ________ from other animals, this is useful for hunting or running away from other predators.

Name at least 3 things in common between the rays and the sharks

Based on the images, comparing this two species, the most recognizable characteristic that differentiates the both of them is ...

• The size of the fins

• The size of their bodies

• The position of their tail

• The position of their mouth

Looking at the image, the name of each part, listed in order, is as follows

• 1. 1. Eye - 2. Spiracle - 3. First Dorsal Fin - 4. Stinging Spine - 5. Disc

• 1. 1. Spiracle - 2. Eye - 3. Second Dorsal Fin - 4. Tail - 5. Lateral Skin Fold

• 1. 1. Eye - 2. Spiracle - 3. Thorn - 4. Tail - 5. Caudal Fin

• 1. 1. Spiracle - 2. Eye - 3. Pelvic Fin - 4. Stinging Spine - 5. Pectoral Fin

The Chimaera have _________ instead of bones, this particularity happens aswell on sharks

Sharks reproduce sexually, the 3 ways in which the shark embryo can develop are ....

Do sharks have a swim bladder? in case that they don´t, what other mechanism they use?

Looking at the images, some of the species shown belongs to the elasmobranchii subclass, they are...

• The shark and the Chimaera

• The Chimaera and the Ray

• The Ray and the Shark

• All of the above