An important characteristic that Hemichordates share with Chordates is:
1. | Ventral tubular nerve cord |
2. | Pharynx with gill slits |
3. | Pharynx without gill slits |
4. | Absence of notochord |
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