4 i guess........................
Since the other answer got deleted, i'll just answer it for you.
a sinoatrial node is the main pacemaker that begins each heartbeat located in the junctions of superior vena cava and the right atrium. It signals from the node that spread through the atria and determines the heart rates.
ACHONDROPLASTI DWARFISM is a condition that is characterized as long, narrow trunk, short limbs and a large head. It is the most common type of dwarfism and it occurs in about 1 out of 40.000 babies. Other features of the condition include: protruding jaw, flattened bridge of the nose, forward curvature of the lower spine and bow legs.
<span>After a long time, a mature community is established and this community does not change unless it is disturbed.</span>
Answer:
1) A 2) C?
Explanation:
1)<em> Most tropical places lay around the equator </em>2) <em>Tundra's can get cool</em>
