eyes
the eye
None, your body stays the same
If you are referring to the size of various body parts, the answer is the EYES. They remain the same size from birth to death.Hope this helps.
The node.
neck
the body part is the liver it is the same size of the heart
Animals whose body temperature usually stays the same are known as "endotherms" or warm-blooded animals. This includes mammals and birds. They can regulate their body temperature internally to maintain a constant level, even when the environmental temperature changes.
Heating gasses or liquids has no effect on their masses.
no
eyes
The part in an experiment that stays the same is called the control variable. It is used as a baseline for comparison with the variable being tested to determine its effect. By keeping the control variable constant, researchers can confidently attribute any observed changes to the manipulated variable.