Which of the following questions best highlights a shortcoming of the big bang theory? a. how can all galaxies move away from each other? b. what makes people think that the universe started from a single point? c. how is the amount of helium in the universe evidence of the big bang? d. what was present before the beginning of our universe?

c. rb

explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.