Answer: A double-layered membrane called the pericardium surrounds your heart like a sac. The outer layer of the pericardium surrounds the roots of your heart's major blood vessels and is attached by ligaments to your spinal column, diaphragm, and other parts of your body.
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Answer:
Four stages
Have a good day :)
I just learned this in my biology class today
Answer:
The bird's respiratory system consists of paired lungs, which contain static structures with surfaces for gas exchange, and connected air sacs, which expand and contract causing air to move through the static lungs
Explanation:
<span>For men, 13.5 to 17.5 grams per deciliter.
For women, 12.0 to 15.5 grams per deciliter.
Hope this helps!!</span>
Plants have the cell wall and the chloroplast. Animal cells share everything else in the cells.
