Compressibility of a liquid is defined as vertical or contraction in volume with variation of pressure. Therefore water is considered as ________?

Respiration rate in sheep is ________?

Top cross was first suggested by________?

If a river or stream is collecting sediment and is building up dunes in its bed is called ________?

________ converts ammonia into nitrite?

When the corolla has four clawed petals inserted at right angle other is said to be________?