What principle is used in the above diagram to calculate the amount of carbon dioxide that is absorbed by land?

The law of conservation of mass

Explanation:

In physics and chemistry, the law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so the quantity can neither be added nor be removed.

rho = density

t = time

nabla = divergence

v = flow velocity field

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

the answer is c.) there is a warm front in region a and a stationary front in region b.