1. | They possess a jaw and paired fins. |
2. | They are endoparasites on fishes. |
3. | They have a cartilaginous skeleton and are devoid of jaws and paired fins. |
4. | Cyclostomes are exclusively found in marine environments. |
Choose the correct statement.
1. All mammals are viviparous
2. All cyclostomes do not possess jaws and paired fins
3. All reptiles have a three-chambered heart
4. All pisces have gills covered by an operculum