Answer:
The bone marrow produces stem cells, the building blocks that the body uses to make the different blood cells. The erythropoietin sends a message to the stem cells telling more of them to develop into red blood cells.
Answer:
Pressure at P point is given as

Explanation:
As we know by poiseuille's equation of viscous flow of liquid through cylindrical pipe

here we know that
L = 4 cm

r = 1 mm
Q = flow rate





now we have



Answer: The induced electric field will be constant i.e zero
Explanation:
Magnetic field is a region of space where magnetic force can be felt while electric field is a region of space where electric force can be felt. This two field are related because they tend to talk about force of attraction and repulsion. Example is running a current through a thin wire near a magnet, the direction of one of the field will determine the direction of the other.
According to the question, if the magnetic field is decreasing, the electric field will adjust by traveling in opposite direction to the magnetic field just to make the field constant.
The heat energy which has to be supplied to change the state of a substance is called its latent heat. Latent heat does not increase the kinetic energy of the particles of the substance, so the temperature of a substance does not rise during the change of state. :))