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