The correct answer is cells.
Some organisms are single-celled, and are only made up of once cell.
But most complex organisms are made up of billions and billions of cells.
All living creatures are composed of at least one cell.
I think the most involved would be your circular system because since your running fast you need to pump blood. Your muscular system because your moving a lot and your respiratory system because you need more oxygen
Answer:
what's your question exactly
Explanation:
comment your question I'd love to help
Answer:
As the liquid freezes the atoms within the liquid slow down because they lose energy, they then begin to form neat rows and turn into a solid.
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