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 |