<em>Although the landscape shows a certain ability to persist, underground mining activity has caused some effects such as ground fissures (cracking), disturbance of the vegetation community and damage to strata.</em>
Answer:
What sends oxygenated blood back to the heart from the lungs?
Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.
Explanation:
i think it is b becuase it gives a lot of infor mation
