Answer:
sorry i dont know the answer
a because the marble changed its position quickly meaning that it was in motion
Pericardium or pericardial sac.
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Teperature
Ph level
Substrate concentration
Not sure if these are physical but hope it helped.
The integumentary system is the skin. Skin protects the inner organs from Bactria. Essentially the skin is a wall protecting against the outside world. It doesn't really release anything but is just there for protection.
Hope this helped!
