Which of the following planets has an iron and nickel core?

a: neptune
b: jupiter
c: saturn
d: mars
plz tell me why it is right plz!

The answer would be Mars

Explanation:

Every inner planet has a core. Mars's core is made of liquid iron sulfide mixed with some nickel.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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