Use the drop-down menus to identify the type of structure being described in each statement. Snakes have remnants of back legs.
Bats have the same arm bone structure as cats,
Frogs, humans, and whales have a backbone.
Bats and moths both have wings, but not a common ancestor.

listen, you cant how young you were.

"you didn't chose the stud life. the stud life chose you."

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.