440 million years ago I hope this helps
I would say it is (b) salt water
I hope it’s correct
As described above, the condition will lead or cause the lung tissue to be less elastic. That being said, the lungs will be limited due to its stiffness. This will lead to decreased lung capacity as well as decreased vital capacity.
They are similar because they are both corresponding bones of the arms and leg
Oxyhemoglobin I believe is the answer. Hope this helps!