Hormone receptor molecules may be increased in number/decreased in number/chemically altered in order to change the target's cell sensitivity to a given hormone.
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Consider two bodies A & B which collide with each other. If 
be the force exerted by the body A on Body B. Then Body B will also exert force 
on Body A which is equal in magnitude but opposite in direction.
The force exerted by Body A on Body B is called Action, and the force exerted by the Body B on Body A is called Reaction.
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Saturn is an outer planet
Your answer !flow directly from the atrium into the ventricle
Answer:
Mitochondrial DNA.
Explanation:
Mitochondria is known as the power house of the cell and one of the important organelle responsible for the production of energy. Mitochondria contains its own DNA.
To understand the maternal ancestor history, the mitochondria DNA must be studied. The mitochondria is solely obtained from the mother as the egg contains large amount of cytoplasm that contains mitochondria. The mitochondria can never be inherited from paternal origin as the sperm contains few amount of cytoplasm and mitochondria.
Thus, the answer is mitochondrial DNA.
