Atomic mass = sum of protons and neutrons
Atomic number = number of protons





Anatomy: Study of .... body parts
Physiology: Study of the functions of the body

Scissors have to be shaped like scissors
 
Levels of organization





The stomach is an organ because it is made of different

Stomach



Cardiovascular system



CDA38_2.jpg

Negative feedback: control system in which the stimulus is reversed.


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atom animation

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Hydrogen bonding between water molecules