Answer:
The Solar System is the Sun and all the objects that orbit around it. The Sun is orbited by planets, asteroids, comets and other things. The Solar System is about 4.6 billion years old.It contains 99.9% of the Solar System's mass. This means that it has strong gravity.
Thanks for reporting and getting my comment deleted! Really appreciate that!!
Answer:
There are 2 Valve Systems
Explanation:
The mitral valve and tricuspid valve are located between the atria (upper heart chambers) and the ventricles (lower heart chambers).
The first one, axons can send messages.
