D. F
Molecules are a group of bonded atoms but Fluorine stands on its own
One difference is that some animals are polyp and some are medusa.
The other difference is that some animals have medusa in their life or polp in their life cycle.
Hope these two differences helps :D
Just search it up on the internet:)
It's the number of Protons of that atom..
It's like saying that if 1 meter is equal to 100 cm,

or

You can base the answers from the chart