Answer:
I would have to say c I have learned this type of stuff in the past
Sometimes, heavy weight on soft soil can result in collapse of ground, resulting in asinkhole<span>. </span>Sinkholes<span> can also </span>form<span> when the land surface is changed. Areas that have a bedrock made of limestone, salt deposits or carbonate rock are most susceptible to erosion and the </span>formation<span> of such holes.</span>
In mammals, the powerful muscle that aids in breathing is the diaphragm. This muscle expands and contracts the chest cavity and forces air in and out of the lungs.
Hope that helped =)
Conductive because it is a touching resource