The life span of RBC is   

The best conductor of heat among the following is

Blood pressure is the pressure exerted by blood on the walls of 

Who among the following anticipated Newton by declaring that all things gravitate to the earth? 

Accumulation of which one of the following in the muscle leads to fatigue? 

In the human body, fats are stored in the 

If the velocity of a body is doubled its kinetic energy

The flow of energy in an ecosystem follows the laws of