Answer:How long each heart beat are apart
Explanation:
the vein isnt conected to ur heart :P
Answer:
They are an addition to your body that is not passed through DNA
Explanation:
It is C because when two species benefit from each other it is called mutualism
Answer:
C. H and O
Explanation:
Almost 99% of the human body's mass is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus, in that order.
Element Symbol % in body
Oxygen O 65.0
Coal C 18.5
The human body is composed of 60% water, that is, H2O.
