Because those vital organs are extremely fragile the bones act as a type of barrier between the organs and whatever the body may come in contact with. Bones like the ribs protect your heart. Other organ like the eyes, brain, lungs, and spinal cord are all protected by bones or your skeleton.
Competition and natural selection
<span>Platyhelminthes phylum. This phylum is known for its flatworms, like planaria, tapeworms and flukes, that later being completely parasitic.</span>
Answer: By breathing out
Explanation: Breathing in oxygen and breathing out CO2.
(Cows also release CO2 by farting)
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