Explanation:
The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart.
Answer:
The reason our blood is read is because we have iron in our blood. (Also our blood cells are red)
I think your answer is D. Red blood cells
Explanation:
Most animals do have iron in their blood so their blood is red.
But... Octopuses (yes that is the write way to say it) have copper in their blood so their blood is actually blue.
The more you know...
Hope this helped! :)
Brainliest?
It's simple. To get the enzymes working properly again you just need to remove the irreversible inhibitor and everything will go back to normal.
