__________ refers to the number of births during a given period in the population that are added to the initial density.
1). Natality
2). Mortality
3). Immigration
4). Emigration
2. A __________ thread is actually stronger than a steel wire
3. _____________ is a collection of data values of same types having a common name.
4. The distance-time graph for the motion of an object moving with a constant speed is a __________.
5. An image formed by a concave mirror on a screen is called __________?
6. Animals in which the cells are arranged in three embryonic layers are called ________.
7. Sexual reproduction in Algae that takes place through fusion of two similar size gametes is called?
8. ___________ is a straw coloured, viscous fluid constituting nearly 55 per cent of the blood.
9. The latitudes of main land of India extends between __________.