| 41. | Echinoderms exhibit secondary radial symmetry in portions of their body at some stage of life.
|
| 42. | The uppermost portion is the only one homologous with the nervous systems of other echinoderms.
|
| 43. | The relationships among ophiuroids and all other echinoderms provide an enduring problem in invertebrate evolution.
|
| 44. | Which is the most authoritative source on echinoderms, and what figure does it give?
|
| 45. | More puzzling is the reason for the fivefold ( pentaradiate ) symmetry of the echinoderms.
|
| 46. | This sea was home to life like bivalves, echinoderms, foraminiferans, and gastropods.
|
| 47. | This is the kind of situation you get into when you travel with an echinoderm lover.
|
| 48. | They are often associated with echinoderms.
|
| 49. | They are spiny, hard echinoderms.
|
| 50. | Echinoderms are marine animals, widespread in all oceans, but not found in fresh water.
|
