Answer:
femur I am pretty sure. The skull sheilds your brain, your ribs for your heart and lungs. backbone spine
Explanation:
Answer: D. Extinctions occur at higher rates during times of ecological stress when populations and species are poorly adapted.
When this occurs, it prevents the public from getting enlightened on the new discoveries of the world making them stay glued to their outmoded way of thinking causing retrogression of the society.
