I think observation and measurable.
I am confident that the answer should be.....<span>A protein acts as a pump and moves calcium ions from an area of low concentration to an area of high concentration.
Hope this helps.
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Answer:
The Skeletal system helped him move his hand away from the hot object.
Explanation:
The Skeletal system consists of our skeleton or the bones. The other options would be correct if the question asked about the<u> nervous system</u> instead of the skeletal system.
