1. Animals used to pull farm implements are referred to as -------
2. ------ Animals live both in water and on land
3. One of these is not an invertebrate
5. One of these is a feature of reptiles
6. -------- enables fishes to remain afloat on water
7. The short span of time which marks the beginning of sexual maturation is called --------
8. The period which lies between the end of childhood and begining of adulthood is called ------
9. Menstrual cycle ----------
10 All these have backbone except -------