A starfish has five equal arms, so a starfish would have 5 lines of symmetry. Hope this helps!
Answer:

Explanation:
Hello,
In this case, given the balanced reaction:

We can see a 2:4 mole ration between permanganate ion (118.9 g/mol) and manganese (IV) oxide (86.9 g/mol), that is why the resulting mas of this last one turns out:

Best regards.
No, because hydrogen isn’t brought out of the equation
Specific heat capacity, which is measured in J/g-°F
D is the answer I believe.