Which characteristic of the sun primarily determines the orbits of planets in our solar system A. large volume
B. strong gravitational field
C. mostly made of hydrogen
D. high surface temperatures
Explain pls

Iv the concentration of ionic substances is important for the heart to beat. your heart responds to electrical impulses that travel through heart cells that are made up mostly of water. which properties of ionic compounds are important to support this function? solubility in water conductivity crystalline melting point الم" الا به done رلرلرللللہ و و او 8