The left atrium lacks a group of pace maker cells.
Answer:
C
Explanation:
I'm honestly not sure, just looks like the right answer
The reason which have caused Antarctica’s climate to change from a more temperate climate to its current climate is being revealed by the first option. It is a well known fact that movement of tectonic is the most powerful thing that influences on the climate. So, the right answer is <span>a. movement of tectonic plates</span>
